You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: We have one train departing bishops stortford at 23:29 and arriving in cambridge at 24:07. Would you like me to book that for you? Sentence2: Yes, please. I also need reference number once it's booked. Sentence3: i have 44 places. can you tll me how much entry fee range is to narrow down our options? Sentence4: Yes, can you help me find a train please. I will be traveling on Monday sometime after 21:45. Sentence5: Try clubbing at Kambar. The address is 1 wheeler street and the phone number is 01223842725. Do you need anything else? Sentence6: I'd like some help finding an interesting attraction in the center of town. Sentence7: Great, how many tickets do you want? Sentence8: I don't have a preference. Just recommend one and send me it's address and phone number. Sentence9: I also need to see the schedule between Bishops Stortfod and Cambridge. Sentence10: Is this for a Train? If so could you provide me with a day and/or time you are looking for? Question: Who has spoken the sentence 5? (A) User (B) System
Answer: (B) System