Task: Dialogue Generation
Input (English): F: Oh, look, you're so dirty. What happened? ,M: I went to the park to help remove the rubbish and now the park is very clean.
(A) F: Why did you play in the park and look dirty? (B) F: That's very nice of you to remove the rubbish of our garden. (C) F: I am sorry. You spoke so rapidly that I did not catch the meaning of what you said. Could you repeat that? (D) F: Why did you fix the shower?
Output (English): C