dialogue: M: Hi, Sarah. What's up? W: Oh, hi, I just got out of a history class. I had to give a presentation. M: How did it go? W: Terribly. I'm sure I made a fool of myself. M: Why? Weren't you prepared? W: No, it was not that. I just get so embarrassed and nervous whenever I have to speak in front of a group of people. I stand up and my face gets red and then I get even more nervous because I know everyone can see me blushing. M: It's not so bad to blush. W: But it happens all the time. If the professor asks a question and I know the answer, I blush like crazy if he calls on me. Doesn't that ever happen to you? M: No, not really. Maybe you should just try to forget about the people. Look at something else in the room like the exit sign. W: I guess I could try that but I doubt it'll help. M: You know we talked about it in psychology class. Blushing, even though it's unintentional, is more or less a learned behavior. W: What do you mean? M: Oh, children hardly ever blush at all. And among adults, supposedly, women blush more than men. W: I wonder why. M: I don't know, but I had a friend at high schools, Brian Smith. It was really easy to make him blush. He turned red whenever a waitress would ask him for his order. W: I'm not that bad. Well,I've got to get going for my next class. I'll talk to you later.
question: Why does the man mention his friend Brian?
choice: To introduce someone who has researched blushing. To illustrate the benefit of a public-speaking class. To give an example of someone who blushes easily.
answer: To give an example of someone who blushes easily.