You could try this:
Organise the quiz with two questions on each page. First the real question, then the Essay question where the student can explain their reasoning.
Quiz
cloze embed question type
ការពិភាក្សាត្រូវបានបិទ ដូច្នេះអ្នកមិនអាចឆ្លើយតបទៀតទេ។