【单选题】

Woman: Mr. Smith would not stop drinking even though the doctor told him that he must.
Man. I wish he could take the doctor's advice.
Question: What do we know about Mr. Smith

A．He could not but stop drinking when his doctor told him that he had to.

B．He agreed to follow the doctor's advice.
C．He still drinks in spite of his doctor's advice.
D．He stopped to drink because the doctor told him to.