Task: Dialogue Generation
Input (English): F: Marco, what can you tell me about pizza? ,M: Well, pizza was originally a peasant food, but nowadays pizza can be very expensive.
(A) F: How can you say that pizza tastes terrible? (B) F: I never knew that pizza was once cheap before you told me this. (C) F: Yes, pizza was once cheap, though its was kind of noble food. (D) F: I’m sorry, I don’t understand. Could you say it again?
Output (English): B