Hello! A 1 multiple choice questions are usually called "single best multiple choice questions"; A2-type questions (case summary type best multiple choice questions); Type A3 questions (the best multiple choice questions in case group); A4 type questions (the best multiple choice questions in case series); B 1 type questions (standard compatibility questions), that is, "indefinite multiple choice questions", an alternative answer may be selected once, multiple times or not.

Because Baidu knows the limitations of the answer principle, it can't be published directly on the website. Please search "What should you understand after reading A 1, A2, B 1, A3, A4, X", and then you will see a post of "Medical Education Forum" with specific examples for you to see!

Good wishes!