A、Allergy to penicillin. B、Application of some ointment. C、Allergy to some pain kiliers. D、A bacterial infection. D由对话第一句话医生说的可知

M: (17) (18) You seem to have a localized skin rash caused by a bacterial infection. This means that you will have to take some antibiotics. (16) Are you allergic to any medicine?
W: (16) (20) Yes, actually, I had a pretty bad reaction once when I took penicillin. I felt a choking sensation and my tongue was badly swollen.
M: OK, then (19) I’ll prescribe an antibiotic without penicillin. You’ll have to take one tablet three times a day, preferably immediately after eating.
W: is there some kind of lotion that I could use on my skin?
M: Yes, I can also prescribe an anti-inflammatory ointment or some talcum powder (滑石粉). (20) Both should help reduce the burning and itching sensation. (19) I recommend the ointment, but I’ll prescribe whichever you prefer. Which would you rather use?
W: (20)Then I’ll take the ointment, as you suggested.
M: You should apply it wherever you need to. Do you feel that you need some pain killers?
W: Yes, that would be quite helpful, I haven’t been able to do anything since this started; it hurts so badly.
M: Well, that should clear it up. If everything looks good, you won’t have to come back again. (20) However, if the symptoms don’t go away after a week, make sure you come back and see me again.
16．What are the man and the woman mainly talking about?
17．What is the woman’s problem?
18．What caused the woman’s current problem?
19．What does the man prescribe for the woman?
20．What is NOT true about the woman?