【正确答案】 C

【答案解析】[听力原文]
   W: Need I take some medicine?
   M: Yes. And I strongly advise you to go on a low-fat diet.
   W: Do you really think that's really important?
   M: Of course. If you don't, you might have a heart attack some day.
   W: Well, I think I should follow your advice. You have been very helpful. Thanks.