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

Sentence1: TR3891 leaves at 16:40 and arrives at 19:23, will that work for you? Sentence2: How about Primavera? Admission is free! Sentence3: I have several entertainment venues across the city. What part of the city would you like to stay in? Sentence4: I need a train leaving Birmingham New Street after 15:45. Sentence5: There are no entertainment venues in the centre. Would you like something different? Sentence6: How about an entertainment venue? Sentence7: I am looking for information in Cambridge. Sentence8: The center of town has 44 different attractions I can recommend. Do you have a particular type you were interested in? Sentence9: Great, thanks for the info. I will go ahead and book myself later. Do you know of any good attractions in the centre of town? Sentence10: No problem. Glad I could help you today. Have a safe trip. Sentence11: What day would you like to travel on? Sentence12: sure, what would you like to know? Sentence13: How about a museum. Any you recommend is fine. I'll need the entrance fee, please? Sentence14: The centre please. Nothing further than that. Sentence15: I need the train for Saturday and I'm going to cambridge. Sentence16: thanks for your help Question: Who has spoken the sentence 13? (A) User (B) System
Answer: (B) System