Task: Dialogue Generation
Input (English): M: Professor Johnson seems so serious. ,F: But his lectures are quite humorous, aren't they?
(A) M: His lectures are quiet? How possible? I think he is not serious. (B) M: I’m sorry, I don’t understand. Could you say it again? (C) M: Why do you think Professor Johnson's lectures are humorous? (D) M: He is not strict at all, I think.
Output (English): C