You will be given a definition of a task first, then some input of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Thanks. I'm also looking for a museum in the area of west. Sentence2: Looking for a train that leaves from london liverpool street and goes to cambridge Sentence3: They are free! Can I help you with anything else? Sentence4: You are very welcome. Have a great time, and thanks for using Cambridge TownInfo centre. Sentence5: What day and time are you planning to leave? Sentence6: No, that is all I need help with at the moment. Thank you. Sentence7: Do you know if they have an entrance fee? Sentence8: There are 7 musuems located in the west. If you are interested in books, I would suggest the cambridge book and print gallery. Sentence9: TR5691 departs at 11:39. Will that work for your needs? Sentence10: I was able to book your ticket. Your reference number is RP24CQ0D . Is there anything else I can help you with? Sentence11: Can you give me the phone number and address? Sentence12: Sure. They are located at 49 newnham road and you can reach them at 01223694264. Sentence13: Yes, that works. I'd like to book that for one person. Sentence14: I would like to leave after 10:15 on tuesday. Question: Who has spoken the sentence 7? (A) User (B) System
Output:
Answer: (B) System