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

Sentence1: No, that is all. Thank you! good bye. Sentence2: The postcode is CB11JG. Is there anything else I can assist you with today? Sentence3: The police phone number is 01223358966. Sentence4: Thank you, may I also please have the postcode? Sentence5: Have a good day! Sentence6: Can you give me the address to the Parkside Police Station? Sentence7: the address is Parkside, Cambridge, with postal code CB11JG Sentence8: What is the police phone number, please? Question: Who has spoken the sentence 4? (A) User (B) System
Answer: (A) User