Detailed Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: I can suggest the Castle Galleries in the city centre. There is no entrance fee. Sentence2: I need it for 4 people, we're staying 2 nights starting Thursday. Sentence3: I want to leave the attraction by 16:15. Please send me the contact number and car type. Thank you! Sentence4: I can certainly help you book a room. I will just need to know how many guests, how many days you are staying, and what day you plan to arrive. Sentence5: In what area? Sentence6: You're all set! The car will be a grey tesla and the contact number is 07137237413. Sentence7: I need information for the warkworth house for my hotel. Sentence8: Thank you! I'm also looking for a good museum to go to. Sentence9: Okay. Can you help me book a taxi to get to there from my hotel? Sentence10: You're all set! Your reference number is XM6Q1AUA . Sentence11: The Warkworth House is a guesthouse located on the east side of town in the moderate price range with a 4 star rating, free internet and parking. Anything else? Sentence12: Hi, I am traveling to Cambridge next month and am so excited to see some local tourist attractions. I do need help with a place to stay. Sentence13: Yes, can you book that for me and send me a reference number please? Sentence14: What area of town will you be staying in? Sentence15: Sure I can help you with that. What time do you want to leave or arrive by? Sentence16: Awesome! That is all I need for now, thank you! Sentence17: Glad I was able to help you today. Goodbye. Sentence18: It does not matter and please provide the entrance fee. Question: Who has spoken the sentence 5? (A) User (B) System
A:
Answer: (B) System