单项选择题

M: Good morning. Sit down, please. What’ s troubling you
W: I have a headache and a sore throat.
M: How long have you been like this
W: About a day.
M: Let me ha. ye a look at your throat first. Please open your mouth and say "ah".
W: Ah...
M: And show me your tongue .... Thank you, that’ll do. Now, let me take your temperature.
W: Do I have a temperature, doctor
M: Yes. You have a slight fever. We’ll give you an injection to bring down the temperature.
W: Can you give me something to relieve my headache
M: I’ll prescribe some pain-killer. Take one when you feel really bad. Don’ t take more than three tablets a day. Stay in bed, drink more water and have a good rest.
W: Thank you for your treatment.
M: Don’ t mention it. I’ m only doing my job.

Why does the doctor give her an injection()

A. To relieve her headache.
B. To bring down the temperature.
C. To relieve her sore throat.
D. To relieve her cold.