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 would like one in the centre area, please. Sentence2: That sounds good! Can you book a table for 6 people at 12:45 on Wednesday? Sentence3: How about Eraina, which serves European food and is located in the centre of town and is in the expensive price range? Sentence4: There are no restaurants anywhere in Cambridge that describe their cuisine as "unusual." Would you like to broaden your search criteria? Sentence5: I have 5 european restaurants to choose from. I have options in the centre, north and west. Which would you prefer to dine in? Sentence6: Hmm. I'm not sure. It needs to be expensive, and I really had my heart set on unusual. Sentence7: That booking was successful, the table will be reserved for 15 minutes. Your reference number is 4OQDTI8C . Is there anything else I can help you with? Sentence8: I'm sorry, there is nothing meeting your criteria. What other type of cuisine would you like? Sentence9: You're welcome, enjoy your meal. Sentence10: I want to eat someplace with unusual food. Price is no object. What can you suggest? Sentence11: I think that is all I need. Thank you. Sentence12: Then find a European one. Question: Who has spoken the sentence 9? (A) User (B) System
Output:
Answer: (B) System