单项选择题
W: Do I need to take some medicine
M: Yes. And I strongly advise you to go on a low-fat diet.
W: Do you really think that’s important
M: Definitely. If you don’t, you might have a heart attack some day.
W: Well. I think I should take your advice. You have been very helpful. Thanks.
A. Husband and wife.
B. Father and daughter.
C. Doctor and patient.
D. Strangers.