Look at Command boxes.
I presume that your questions are in a table or query. If you also put the
answers in that query you should be in a position to assign eash answer to a
command box.
Then if you are telling them straight away right or wrong no problem. In
addion you could not tell them and then add the score up at the end.
If you want to you can ramdomly put the answer in a, b, c or d so the next
time the same question comes up it is not the same letter answer as last
time. (Look at random)
If more detailed answer required please ask. I will help.