M: Come in, Madam. What’s the matter with you
W: I don’t feel well, doctor. My head aches. And I have a sore throat (喉咙).
M: Do you have a fever
W: I think so.
W: Well, let’s see. Put this thermometer (温度计) under your tongue.
W: All right.
M: Yes, you have a fever. I want to take a look at your throat. Open your mouth.
W: What’s wrong with me, doctor
M: Well, you have the flu. I’ll give you some medicine.
W: When do I take the medicine
M: Every four hours. I want you to stay in bed and rest. And drink plenty of water. I’ll come to see you in a day or two.
W: Thank you, doctor.

What seemed to be the woman’s trouble（）

A. The flu.
B. A headache.
C. A fever.