If Someone Complains of Pain When No Medical Cause Can

If someone complains of pain when no medical cause can be found,what will their pain be like?

A) The pain can be real even if it goes away with psychological treatment.
B) If psychological treatment eliminates the pain, the pain cannot have been real in the first place.
C) The pain usually goes away when the person is sleeping, which is a key indication that the pain is not real.
D) Unlike true pain, the pain originates from the brain and not the part of the body that feels injured.