Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: The address is Hills Rd, Cambridge with postcode CB20QQ. Do you need anything else? Sentence2: You're welcome. Goodbye. Sentence3: Okay, I have Addenbrookes Hospital. The phone number is 01223596055. Sentence4: Can I have the address please? Sentence5: I got injured and I am looking for a hospital nearby. The hospital should have the clinical research facility department Sentence6: No, that is all I need. Thank you for your help. Question: Who has spoken the sentence 4? (A) User (B) System
Output:
Answer: (A) User