You will be given a definition of a task first, then some input of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: I'm sorry, but the system doesn't have info for what you are looking for. Is there a different type of food you may want? Sentence2: there are 3 restaurants serving international food, which area of town are you interested in? Sentence3: I don't care. Sentence4: Bloomsbury restaurant address is Crowne Plaza Hotel 20 Downing Street. Sentence5: Can I have the address please? Sentence6: Goodbye. Sentence7: You're welcome. Good bye. Sentence8: yes, international food Sentence9: Bloomsbury restaurant serves international food Sentence10: I want to find a restaurant serving basque food. I don't care about the price range Sentence11: Thank you, goodbye. Sentence12: Have a good day. Question: Who has spoken the sentence 4? (A) User (B) System
Output:
Answer: (A) User