true/false questions

hi

I’ve been seen that this questions (true/false) can be answered correctly viewing the html code (data-is-correct=”1″ is the correct answer).

could this be hidden…?

I haven’t tried other types of questions, but if the same thing happens, I think it should be hidden…

<div class="quiz-answer-input-field">
    <input name="attempt[1][quiz_question][1]" type="radio" value="1" data-is-correct="1">
    <span>&nbsp;</span>
    True
</div>
<div class="quiz-answer-input-field">
    <input name="attempt[1][quiz_question][1]" type="radio" value="2" data-is-correct="0">
    <span>&nbsp;</span>
    False
</div>