Given the task definition and input, reply with output. You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Please send me their address. Sentence2: That is all I need. Sentence3: Please help me find people's portraits exhibition at girton college. Sentence4: People's Portraits Exhibition at Girton College is located at Girton College on Huntingdon Road in the west side of town. Would you like their phone number? Sentence5: Sure, the address is Girton College, Huntingdon Road cb3ojg. Is there anything else I can help you with? Sentence6: Great! By the way, there is no entrance fee as well. Let us know if we can help with anything else. Question: Who has spoken the sentence 1? (A) User (B) System
Answer: (B) System