A、Caesar’s army. B、Give up smoking. C、Hypnotism. D、Ordinary life. CWhat is the major topic of the conversation?

M: Good morning, Percy.
W: Trevor, you have one of the most unusual stories I’ve ever heard. Yet, nowadays, you seem to lead a very ordinary life.
M: Yes, Percy. I’m a dentist. I live and work in London.
W: But at one time you used to have a different job?
M: Yes, I was a soldier.
W: A soldier?
M: That’s right.
W: And how long ago was that?
M: Oh, about two thousand years ago.
W: That’s right. Trevor Cartridge believes that he was a soldier in the array of Julius Caesar. He remembers coming to Britain with the Roman army two thousand years ago, Trevor, tell us your remark able story...in your awn words!
M: Well, funnily enough, it all began because I wanted to give up smoking.
W: Give up smoking?
M: Mm, I used to smoke too much and I tried to give up several times, but I always started smoking again a few days later. In the end I went to a hypnotist. He hypnotized me, and I stopped smoking at once I was delighted, ms you can imagine.
W: Yes?
M: That made me very interested in hypnotism, and I talked to the hypnotist about it. He told me that some people could remember their past lives when they were hypnotized, and he asked if I wanted to try. I didn’t believe it at first, but in the end I agreed, He hypnotized me, and sure enough I was a Roman soldier in Caesar’s army.
W: You didn’t believe it at first?
M: I didn’t believe it before we tried the experiment. Now I’m absolutely convinced it’s true.