Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: Do you know of any moderately priced restaurants in the north part of town? I'll need the address and phone number. Sentence2: Enjoy your stay, good bye. Sentence3: The Golden Wok is located at 191 histon road Chesterton. It's phone number is 01223350688. Sentence4: Thank you good bye. Question: Who has spoken the sentence 1? (A) User (B) System
Output:
Answer: (B) System