dialogue: M: Can I help you? W: Yes, we want to go to Chinatown. M: OK. You can take a taxi. It's about a ten-minute ride, and the fare is three dollars. Or you could walk. It'll probably take you twenty minutes. W: OK. That's what we'll do. It's free and good exercise, too.
question: How will the woman get to Chinatown?
choice: On foot. By underground. By taxi.
answer: On foot.