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: Good bye. Sentence2: Certainly, The Gardenia is located at 2 Rose Crescent City Centre and can be reached at 01223 356354. May I be of further assistance? Sentence3: The Gardenia sounds good. Thanks. Sentence4: The Gardenia is a cheap restaurant that serves Mediterranean food. Is the centre part of town okay for you? Sentence5: I would like a cheap restaurant that serves mediterranean food Sentence6: Yes, thank you. Could you tell me the address and phone number of that restaurant? Question: Who has spoken the sentence 4? (A) User (B) System
Output:
Answer: (A) User