Detailed Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Problem:Sentence1: nandos city centre is at 33-34 Saint Andrews Street. Sentence2: Hello, I am looking for a restaurant that serves Portuguese food. Sentence3: Thank you so much! Sentence4: nandos city centre serves portuguese food. They are in the centre of town and are in the cheap price range. Sentence5: What is their address? Sentence6: You're welcome. Goodbye. Question: Who has spoken the sentence 4? (A) User (B) System
Solution:
Answer: (A) User