You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Old Schools is on Trinity Lane, and their phone number is 01223332320. Can I help with anything else today? Sentence2: Thank you for the help! Have a nice day. Sentence3: There are a lot of attractions to see in the centre, from architecture, colleges, and museums. What kind of attractions are you looking for? Sentence4: I would like to book that for 8 people please. Can i get the reference number? Sentence5: There are a quite a few trains that leave from kings lynn. Did you want to leave on a certain day? Or arrive by a certain time? Sentence6: I'll visit anything. I don't much care the type. Sentence7: The train should leave on monday and should go to cambridge. I don't care about the arrival time. Sentence8: The TR0684 which leaves at 11:11 would work well for you. Want me to book that? Sentence9: Hi, I am looking for attractions in the centre of town. Do you have any recommendations? Sentence10: Ok. What is the address and phone number for old schools? Sentence11: How about Old Schools? It's an architecture attraction that's free. Sentence12: You have a great day too! Don't forget, when you're in a bind, call the Cambridge TownInfo centre! Sentence13: I also need a train to leave after 10:45 from kings lynn Sentence14: All booked! The reference number is M50TGTUW . Question: Who has spoken the sentence 11? (A) User (B) System
Answer: (B) System