I have a problem: I have an multiple choise question with 3 answer options... I only want to give the learner the option to click ONLY one of the answer field. And if he click another one the first...
If you want to have buttons (or any objects with Normal and Selected states) work so only one can be selected at a time, put them into a button set. To do that, select the objects, right click, and then click to put them into a set. I recommend clicking New Set. That will let you name the set, which can be helpful if you have multiple button sets on the same slide..