Detailed Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: i have plenty of trains, can i get more information please? Sentence2: What's the postcode for your favorite one? Sentence3: No, thank you. You've been very helpful! Goodbye. Sentence4: I need to leave on sunday after 12:30 from cambridge to stevenage Sentence5: I've booked two tickets for the TR0523 train, and your reference number is R6GCVVA0 . Can I help you with anything else today? Sentence6: There are 44 different things to do in the centre of Cambridge. Can you help me narrow it down by type of activity or attraction? Sentence7: I also need to book a train. Sentence8: My personal favorite is holy trinity church. They are on market st and the postcode is cb23nz. Anything else I can help you with today? Sentence9: I'm looking for places to go in the centre of Cambridge. Sentence10: Great, can I get two tickets on it, please? Sentence11: Thank you for contacting Cambridge TownInfo centre. I hope you have a pleasant trip! Goodbye! Sentence12: The first train after 12:30 is the TR0523, which leaves Cambridge at 13:21. Question: Who has spoken the sentence 11? (A) User (B) System
A:
Answer: (B) System