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

Sentence1: No, that's all the information I need. Thanks. Sentence2: Thanks very much, what is its postcode? Sentence3: Is there anything else I can help you with? Sentence4: Sure, it is located in Parkside, Cambridge. Sentence5: may you help me find the nearest police station Sentence6: You're quite welcome. Thanks for using our service! Sentence7: Great, thank you for the help. Sentence8: The post code for the police station is CB11JG. Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User