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

Sentence1: The closest hospital is Addenbrookes Hospital at Hills Rd., Cambridge. Anything else I can help with? Sentence2: The number is 01223245151 and postcode is CB20QQ. Do you need an officer or the number for the police? Sentence3: Yes, can I have their post code and phone number? Sentence4: Hey, I've been injured. Where's the closest hospital? Question: Who has spoken the sentence 3? (A) User (B) System
Answer: (B) System