Given the task definition and input, reply with output. You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: I have made your booking here is the information:Booking was successful. The table will be reserved for 15 minutes. Reference number is : VVSOH0TQ . Sentence2: What's a good college to visit near the restaurant? Sentence3: Any college will be fine what do you recommend? I need the phone number for whichever you pick. Sentence4: christi's college is in that area and has free entrance. There phone number is 01223334900. Is there anything else I can assist you with? Sentence5: I would prefer the british food. Sentence6: I have cotto that serves moderate priced food. Would you like to book a table? Sentence7: I have 7 in the centre that serve british food. I have 4 in the moderate price range and 3 in the expensive. Did you have a preference? Sentence8: Thank you for choosing us and enjoy your stay. Sentence9: There are no crossover locations in Cambridge. Sentence10: There are 13 colleges in the centre. Is there a particular one you are interested in? Sentence11: Where's a good place to eat crossover food in Cambridge? Sentence12: That is all I needed. Sentence13: How about British restaurants in the Centre instead? Sentence14: Yes please make a booking for 8 people at 12:30 on friday. Question: Who has spoken the sentence 5? (A) User (B) System
Answer: (B) System