Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: I have christ's college in the centre part of town. The entrance fee is free. Sentence2: I have a train that arrives by 07:55. Would you like me to book that for you? Sentence3: a college please Sentence4: I am not ready to book seats quite yet thank you. I do need to find a place to visit while in town though. Sentence5: There are 18 colleges in Cambridge. What part of town would you like it to be in? Sentence6: You misunderstood, I'm looking for a college to visit while I'm in Cambridge. Sentence7: I don't have a certain part of town. Pick one that you recommend and I will need the area and entrance fee. Sentence8: The total travel time for TR0953 is 79 minutes and will cost 14.08 pounds per ticket. Would you like to reserve a seat? Sentence9: Okay. What is your destination? Sentence10: I need to arrive in Norwich by 8:45 Sentence11: I'm looking for information on trains leaving Cambridge on Saturday Sentence12: I'm sorry but there are no colleges in Norwich. Are there any other areas or type of place I can look up for you? Sentence13: Please contact us if you need further assistance during your visit. Sentence14: Not just yet. What is the travel time? Sentence15: No thank you, that will be everything. Sentence16: Cam you tell me more about the place? Sentence17: The college is on saint andrew's street. Can I help you with anything else today? Sentence18: What type of attraction are you looking for? Question: Who has spoken the sentence 17? (A) User (B) System
Output:
Answer: (B) System