Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: On Sunday TR0523 leaves at 13:21, would that work for you? Sentence2: The Primavera's postcode is cb21sj. Is there anything else you need help with? Sentence3: Yes, that will be fine. I am also looking for museums in the centre. Sentence4: Yes, I think that will be just fine. Can you please tell me how much it will cost? Sentence5: I have 11 different choices. Might I suggest the Primavera. They just added many new exhibits. Sentence6: Okay. Glad I could help. Sentence7: I need to leave on Sunday from Cambridge. Sentence8: Sounds great, what's the post code? Sentence9: The first train to Stevenage leaves at 13:21 on either Wednesday or Friday. Which day will you be leaving? Sentence10: No that is all I need. Sentence11: It is 10.24 pounds per ticket. Can I book that for you? Sentence12: I'm looking for a train to stevenage that leaves after 11:45 Question: Who has spoken the sentence 3? (A) User (B) System
Output:
Answer: (B) System