In this task you are given a small conversation between two persons and 4 options on how the conversation should continue. Your job is to choose the most reasonable option. The conversation and the options are separated by a newline character. Each dialogue in the conversation are separated by a comma. F and M indicate female and male, respectively.

Ex Input:
M: Call your mom and tell her that we will be home later than expected. ,F: Um, we are in the tunnel now and the mobile phones' signals are dead.
(A) M: How do you know that your mom is in the area with poor signal reception? We are not in the tunnel now. (B) M: Can't you make a phone to your mom now, telling her that we will be home earlier? (C) M: Excuse me, could you repeat the question? (D) M: Do you think we should tell mom that someone is dead, even though the mobile phones' signals are good?

Ex Output:
C


Ex Input:
M: By the way, miss. Where is the toilet? ,F: The toilet is there, but I'm afraid it's full at the moment. ,M: What? Oh, I think I have to wait. Thank you very much for your help, miss.
(A) F: No problem. Since you have known where the toilet is, you'll have to wait. (B) F: Just a minute! I do not quite follow what you are saying, would you mind repeating that? (C) F: I don't know where the toilet is, but you're booking a table, aren't you? (D) F: I don't know where the toilet is, but you're waiting for me, aren't you?

Ex Output:
A


Ex Input:
F: Mr. Smith, may I ask you a question? ,M: Yes, go ahead, please. ,F: For quite a long time, I've not been sure of two phrases. I'm sorry and excuse me. It seems that they have exactly the same meaning when we put them into Chinese. Could you tell me how to use them correctly? ,M: Alright. In fact, there are a lot of differences between the two. I'd better show you some examples. Suppose you are chatting with someone, if you'll use a phrase as a polite way of indicating that you are about to leave or that you are about to stop it. ,F: I am sorry? ,M: No, we say, excuse me or excuse me, please. And excuse me is also used when we are going to interrupt someone who is speaking or...... ,F: Excuse me, Mr. Smith. ,M: Very good, Miss Yang. What are you going to say? ,F: If we knock into somebody by chance, when pushing our way out, we should then say sorry or I'm so sorry? ,M: You learn so fast.
(A) F: Thank you sir, your present has been wrapped. Thanks again for coming ton our store. (B) F: I have a headache for a week and feel weak, awful and cold. What's wrong with me, doctor? (C) F: So glad that I can help. My office hour is 8:00-12:00 every Wednesday. You are welcomed to come. (D) F: Excuse me, could you repeat the question?

Ex Output:

D


