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

Sentence1: Addenbrookes Hospital has a transplant high dependency unit. The phone number for the transplant high dependency unit is 01223216811. Would you like the address and postcode as well? Sentence2: I am trying to find a hospital that has a transplant high dependency unit. Sentence3: No, that's all I need. Thank you! Sentence4: Okay. Thanks and have a great day! Question: Who has spoken the sentence 1? (A) User (B) System
Answer: (B) System