Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: Great, thanks! That'll be all that I need for today! Sentence2: We have entertainment venues, museums, & colleges to visit. Is there a particular attraction type you would be interested in? Sentence3: Clare College is a popular attraction on the west side. The entrance fee is 2.50 pounds and the postcode is cb21tl. Can I help you with anything else? Sentence4: The 16:09 will have you there at 17:54 if it is on time. Would you like me to book you a seat? Sentence5: Hey, I am looking for a train that leaves leicester to cambridge, where is it? Sentence6: 105 minutes is the travel time. May I help you with anything else today? Sentence7: Yes you can. I'd like to see a few things while I'm in town so find me something nice to check out on the west side. Sentence8: There are many trains each day that run between Leicester and Cambridge. What time would you like to travel? Sentence9: I would like to leave on Thursday and arrive by 18:15. Sentence10: I don't need to book now. What is the total travel time for that train? Sentence11: You are welcome, enjoy your stay in Cambridge. Sentence12: Any attraction you recommend will be great. I just need the postcode and entrance fee. Question: Who has spoken the sentence 7? (A) User (B) System
Output:
Answer: (B) System