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

Sentence1: I will be going to Norwich this Thursday. Sentence2: I am looking for a train that will leave after 14:00 and should depart from cambridge. Sentence3: What's the entrance fee, address, and phone number? Sentence4: Thank you for choosing the help desk. Good Bye Sentence5: I'm sure we can find what you're looking for. Where will you be traveling to? Sentence6: Hi, can you suggest some tourist sites to visit in Cambridge? Sentence7: Christ's college is free to enter. It's located on saint andrew's street, and their phone number is 01223334900. Is there anything else I can help you with? Sentence8: Christ's College is on Saint Andrew's Street in the centre. It is lovely. Sentence9: Yes, I'd love to visit a college. Is there a nice one in the city centre? Sentence10: There are 79 tourist sites listed in Cambridge. What type of attraction are you interested in seeing? Sentence11: How about the TR5190 train? It leaves Cambridge at 14:36 and arrives in Norwich at 15:55. Sentence12: That sounds perfect, that's all that I needed to know, thank you for your help! Question: Who has spoken the sentence 10? (A) User (B) System
Answer: (A) User