单项选择题

Questions 18～21 are based on the following dialogue between two friends talking about traveling.
M: So you’re visiting San Francisco
W: Yes, I just got here the day before yesterday, and you
M: I’m a native.
W: Oh, really All the people I meet here are tourists like me. I was beginning to think that maybe there were no natives.
M: Well. San Francisco has a lot of different ethnic groups, so you might think you’re seeing a lot of foreigners. But in fact, the city has a population of about 700, 000 people.
W: What are the ethnic groups
M: Well, after whites, the largest one is blacks.
W: I thought it was Chinese.
M: It’s true that San Francisco has the largest Chinese community outside Asia. But the black people there are more than Chinese.
W: That’s interesting. Don’t most of the Chinese people live in China-town
M: Well, no, they live throughout the city, but Chinatown is definitely the center of Chinese culture here. That’s where you’ll find the best Chinese restaurants, bookstores, art theaters and things like that.
W: How about the Japanese Doesn’t San Francisco have a large Japanese population too
M: No, actually there are only about 12,000 Japanese people here, but we do have an area called "Japan town" that has Japanese restaurants and bookstores.
W: You seem to know a lot about this city.
M: Well, most San Franciscans think their city is pretty special. We like to talk about it. Besides, I teach ethnic history at the university here.
W: No wonder you know so much!

Which is the largest ethnic group in San Francisco()

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