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.

Example Input: F: Excuse me, are you going to buy that textbook? ,M: Well, yeah, I need it for a class. But it's awfully expensive. ,F: Oh, we must be in the same class! Civil engineering? ,M: Yes, that's the one! ,F: Were you there last Friday for the first class? ,M: Yes. I only moved here last Monday, and I registered for the class last Tuesday. By the way, I thought Professor Qian really seemed to know his subject.
(A) F: Great. Since you moved here last month, you must have your first class last Monday. (B) F: Yes. It is great that you registered for class last Monday and had your first class last Tuesday. (C) F: His courses are great. You must learnt a lot of Civil Engineering in your first class last Friday. (D) F: I am afraid I did not quite catch what you were saying. Please repeat it.
Example Output: C

Example Input: F: Look at the monkeys running around on the rocks. They are so lovely. ,M: Yes, their surrounding seems to suit them very well. Let's go over and see the panda now.
(A) F: Just a minute! I do not quite follow what you are saying, would you mind repeating that? (B) F: Before we go, do you know where is the toilet in this zoo? (C) F: Excuse, how much are these in total? (D) F: I can't find this museum's exit.
Example Output: B

Example Input: F: Hello. Welcome to this week's People You Meet. Today, we present to you Mark Leach, an information officer in London. ,M: Hi everyone, my name's Mark Leach. I'm an information officer at the Britain Business Center, which is a tourist office for the British tourist board in London. Here, we offer a tourist information service to mainly visitors from overseas. And each year, we have about 500,000 people come to the office.
(A) F: I’m sorry, I didn’t understand. Could you repeat a little louder, please? (B) F: I can't believe that your office receives 500,000 people every year. (C) F: Wow, your office receives 200,000 people every year. That's a lot. (D) F: I can't believe that your office receives 500,000 people every month.
Example Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
B

