A Patient States "My Doctor Said Sometimes I Would Have

A patient states "My doctor said sometimes I would have an on/off problem with this medication what does that mean?" The best response by the nurse is which of the following?

A) "The on times will be when your symptoms are under control; the off times are when you will have increased problems with symptom management."
B) "There will be times when you are depressed (off) and when you are happy (on) ."
C) "You will have to take breaks from this medicine by stopping (off) and starting it (on) again, so you don't build up a tolerance to it."
D) "I'm not a pharmacist, so I shouldn't be answering this question."