<ListBox x:Name="ListBoxQuestionAnswers" ItemsSource="{x:Bind Question.Answers}" SelectionMode="Single" SelectionChanged="ListBoxQuestionAnswers_OnSelectionChanged">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <TextBlock x:Name="TextBlockInListBox" TextWrapping="Wrap" Text="{Binding}"/>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>

private void ListBoxQuestionAnswers_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (ListBoxQuestionAnswers.SelectedIndex == Question.CorrectAnswerIndex)
        {
            Application.Current.Resources["SystemControlHighlightListAccentLowBrush"] = new SolidColorBrush(Colors.Green);
            Application.Current.Resources["SystemControlHighlightListAccentMediumBrush"] = new SolidColorBrush(Colors.Green);
        }
        else
        {
            Application.Current.Resources["SystemControlHighlightListAccentLowBrush"] = new SolidColorBrush(Colors.Red);
            Application.Current.Resources["SystemControlHighlightListAccentMediumBrush"] = new SolidColorBrush(Colors.Red);
        }

    }