You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: No, I just need the postcode, please. Sentence2: Addenbrookes Hospital is located at Hills Rd, Cambridge and has a neurology department. Do you need the phone number? Sentence3: Thank you, I think that is all I needed. Sentence4: Am injured and are looking for a hospital nearby it should have the neurology neurosurgery department Sentence5: Be careful, let us know if we can be of more assistance. Sentence6: The postcode is CB20QQ. Question: Who has spoken the sentence 4? (A) User (B) System
A:
Answer: (A) User