Testing Hausa Quiz codes using flutter and dart with no bool. Two options with one correct answer. Will update the code later to a full project

Hquiz.dart

import 'package:flutter/material.dart';

void main() => runApp(Quizzler());

class Quizzler extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('HausaQuiz'),
          backgroundColor: Colors.purpleAccent,
        ),
        backgroundColor: Colors.grey.shade900,
        body: SafeArea(
          child: Padding(
            padding: EdgeInsets.symmetric(horizontal: 10.0),
            child: QuizPage(),
          ),
        ),
      ),
    );
  }
}

class QuizPage extends StatefulWidget {
  @override
  _QuizPageState createState() => _QuizPageState();
}

class _QuizPageState extends State<QuizPage> {

  List<Icon> scoreKeeper = [];

  List<String> questions = [
    'Ban ci nanun ba...',
    'Dan tuwon gobe...',
    'Kowa ya tuna bara...',
    'Kallo ya koma Kano...'
  ];

  List<String> answers = [
    'nanun ba zata ci ni ba.',
    'ake wanke tukunya.',
    'bai ji dadin bana ba.',
    'ɓarawo ya kori sarki.'
  ];

  List<String> incorrectOptions = [
    'nanunta ci ni.',
    'ake wanke kwano.',
    'bai ji dadin aiki ba.',
    'dutsen Dala ya koma Gwale.'
  ];

  int questionNumber = 0;
  int answerNumber = 0;
  int incorrectOptionNumber = 0;
  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.spaceBetween,
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: <Widget>[
        Expanded(
          flex: 5,
          child: Padding(
            padding: EdgeInsets.all(10.0),
            child: Center(
              child: Text(
                questions[questionNumber],
                textAlign: TextAlign.center,
                style: TextStyle(
                  fontSize: 25.0,
                  color: Colors.white,
                ),
              ),
            ),
          ),
        ),
        Expanded(
          child: Padding(
            padding: EdgeInsets.all(15.0),
            child: FlatButton(
              textColor: Colors.white,
              color: Colors.purpleAccent,
              child: Text(
                answers[answerNumber],
                style: TextStyle(
                  color: Colors.white,
                  fontSize: 20.0,
                ),
              ),
              onPressed: () {
                //The user picked true.

                String correctAnswer = answers[questionNumber];

                // ignore: unrelated_type_equality_checks
                if (correctAnswer == answerNumber) {
                  print('user got it wrong!');
                } else {
                  print('user got it right');
                }
                setState(() {
                  questionNumber++;
                  answerNumber++;
                  incorrectOptionNumber++;
                });
                print(questionNumber);

              },
            ),
          ),
        ),
        Expanded(
          child: Padding(
            padding: EdgeInsets.all(15.0),
            child: FlatButton(
              color: Colors.purpleAccent,
              child: Text(
                incorrectOptions[incorrectOptionNumber],
                style: TextStyle(
                  fontSize: 20.0,
                  color: Colors.white,
                ),
              ),
              onPressed: () {
                //The user picked false.

                String incorrectAnswer = incorrectOptions[incorrectOptionNumber];

                // ignore: unrelated_type_equality_checks
                if (incorrectAnswer == incorrectOptionNumber) {
                  print('user got it right!');
                } else {
                  print('user got it wrong');
                }
                setState(() {
                  questionNumber++;
                  answerNumber++;
                  incorrectOptionNumber++;
                });

                print(questionNumber);
              },
            ),
          ),
        ),
        Row(
          children: scoreKeeper,
        ),
      ],
    );
  }
}

/*
question1: 'Ban ci nanun ba...', 'nanun ba zata ci ni ba.',
question2: 'Dan tuwon gobe...', 'ake wanke tukunya.',,
question3: 'Kowa ya tuna bara...' 'bai ji dadin bana ba.',
question4: 'Kallo ya koma Kano...', 'ɓarawo ya kori sarki.'
*/