How o force the user to select a single checkbox with HTML? [duplicate]

I am creating a quiz in HTML. The questionnaire can be answered by selecting a checkbox. So far try this:

<h3>This is question 1?</h3>
<input type="radio" name="answer1" id="c01" value="0"/> answer A
<input type="radio" name="answer2" id="c02" value="0" /> answer B
<h3>This is question 2?</h3>
<input type="radio" name="answer3" id="c03" value="0"/> answer 1
<input type="radio" name="answer4" id="c04" value="0" /> answer 2
<input type="radio" name="answer5" id="c05" value="0"/> answer 3

However, the previous statement doesnt work because I only want to be possible to select one and only one answer (selecting more than one checkbox per answer is not allowed). How can I force the user to only select a single checkbox for each different question by only using html tags?