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.

What’s the probable relationship between the two speakers().

A. Husband and wife.
B. Father and daughter.
C. Doctor and patient.
D. Strangers.

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