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.