单项选择题

[听力原文]8-10
M: What’s the matter with you, madam
W: I have a headache. And I felt dizzy and cold.
M: You probably have got the flu. Let me check your pulse and take your temperature. Oh, you do have the flu,
W: Is it serious
M: Take it easy. Here is the prescription and get some medicine, you will be better soon.
W: Do I have to be given an injection
M: Yes, before you leave, I want my nurse to give you an injection.
W: Okay. Do I have to go on a diet
M: Not necessarily. Drink as much water or juice as you can, avoid greasy food and keep warm.
W:Thank you.

What is the probable relationship between the two speakers（）

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