dialogue: W: Good morning. What seems to be the problem? M: Good morning, Mrs Brown. I have a cough and a fever and I feel very tired all the time. W: And how long have you been feeling like this? M: Three days now. W: Let me have a look. Open your mouth please. Wider please. Now say AHH. M: AHHH. W: Now take your shirt off please. Breathe in-Breathe out-OK, you can put your shirt back on now. M: What seems to be the problem? Do I suffer from bird flu or is there something wrong with my lung? W: Oh, no. Don't be so nervous. You just have a bad cold. Do you work in an air-conditioned office? M: Yes, I do. W: I thought so. I see many people who work in air-conditioned offices. It's the air conditioning, you see. It's really not very good for your health. M: So what would you suggest, doctor? W: I suggest you get out of the office as regularly as possible. Walk around, and get some fresh air. That will help. You also need to get more exercise. Do you play any sports? M: I sometimes play tennis in summer, but to be honest, I'm too busy to get regular exercise. W: Then I suggest you try playing more often. Say once a week. M: OK, no problem. Thank you doctor. Bye. W: Bye.
question: What caused the man's illness?
choice: The tiredness. The air conditioning. No regular exercise.
answer: The air conditioning.