Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: No problem. Sentence2: Thank you for using the Cambridge Town Info Centre Services! Sentence3: Booking was successful, the total fee is 89.6 GBP payable at the station. Reference number is : E05ZQIF7 . Is there anything else I can do for you? Sentence4: I'm also looking for a cool college to visit in cambridge. Do you have any recommendations? Sentence5: TR9448 is available, would you like to book that one? Sentence6: Find me a train out of stevenage for Wednesday Sentence7: That's all I needed to know, thanks for your help! Sentence8: Thank you for using our service today. Sentence9: Yes, I'd like to arrive in Cambridge by 8:30. Sentence10: Please. I'll need 7 tickets. Sentence11: corpus christi is very popular. It is located in the town centre. The number is 01223338000. Can I help with anything else? Sentence12: Is there a time you'd like to leave or arrive by? Question: Who has spoken the sentence 5? (A) User (B) System
Output:
Answer: (B) System