You can add as many possible answers as you wish. When you have finished adding answers, click the check box to the right of one of the answers to designate the correct answer. Then click Update when you have finished. After adding one or more questions to a page, a new Self Test icon appears in the Button Bar. When students click the Self Test icon, the questions and possible answers you have prepared appear on the screen.
Students are can click all possible answers until they click the correct one.
The value of these questions will probably depend on the motivation of the student, and the feedback that you provide.