Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: Ugly duckling is an expensive chinese restaurant and very good too. Address 12 St. Johns Street in city centre. Would you like me to make reservations for you? Sentence2: Yes please. I would like that very much and I also would like information on the Ugly Duckling restaurant. Sentence3: The entrance fee is not listed would you like the phone number or address? Sentence4: We have the cambridge arts theatre, the adc theatre, mumford theatre, the cambridge corn exhange, and the junction. Sentence5: What theaters are in the Cambridge centre? Sentence6: Ok, can I get the address and entrance fee for the Mumford Theatre? Question: Who has spoken the sentence 4? (A) User (B) System
Output:
Answer: (A) User