根据对话内容，从方框内所给的选项中选出最佳选项，选项中有两项为多余项。
a. How often should I take the medicine?
b. Yes, I do.
c. I have a bad cold.
d. Good afternoon, young man.
e. For about two days.
f. Yes, thank you.
g. No, I am not.Dick: Good morning, Liu Yong!
A: Good afternoon, Doctor Huang.
B: What's wrong with you?
A:
B: Do you have a cough?
A: I cough now and then.
B: How long have you been like this?
A: And I'm feeling terrible now.
B: Let me check you over. Oh, you have a fever, too.
A: Is it serious?
B: Nothing serious. Take this medicine and drink more water.
A:
B: Three times a day. Have a good rest and you'll be all right soon.
A: Thanks a lot.
B: Not at all.
