You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: The hospital is located on Hills Road Postcode CB20QQ. Each surgery department has a different number. Which surgery department do you need? Sentence2: I need the surgery department of the Addensbrookes Hospital. Sentence3: You're welcome. Have a great day. Sentence4: I don't need the phone number. I just needed the address. Thank you for your help. Question: Who has spoken the sentence 3? (A) User (B) System
A:
Answer: (B) System