A Patient Has Been Diagnosed with a Ganglion Cyst Over

A patient has been diagnosed with a ganglion cyst over the dorsum of his left wrist.He asks the nurse,"What is this thing?" The nurse's best answer is:

A) "It is a common benign tumour."
B) "It is a tumor that will have to be watched because it may turn malignant."
C) "It is caused by chronic repetitive motion injury."
D) "It is a skin infection that will need to be drained."