You will be given a definition of a task first, then some input of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: I am looking for a cinema, are there any in the area? Sentence2: I need a cinema in the north. Sentence3: Okay, great. Thank you for your help! Sentence4: Thank you, I also need a taxi to communte between the two places. I'll need to leave the kings hedges learner pool by 3:45. Sentence5: Thanks. Yes, I am also looking for places to go when I get there. Are there any cinemas in the same area as Archway House? Sentence6: I definitely need free wifi, and I'd like a 4 star place. Sentence7: No problem, is there anything else I can help with? Sentence8: 01223353248 and cb42xh respectively Sentence9: look out for a blue ford. the contact is 07584361462 Sentence10: What about a pool in the north? Sentence11: archway house is a guesthouse. The address is 52 gilbert road and the phone number is 01223575314. Is there anything else I can help you with? Sentence12: Unfortunately there are no cinemas in the north part of town. Would you like me to see if we have a few located in a different area? Sentence13: I can certainly help with that! Can you tell me a little more about what you're looking for? Sentence14: Can I have the phone number and postcode for Kings Hedges? Sentence15: There are 2 pools in the north, jesus green outdoor pool and kings hedges learner pool. Would you like more information on one of them? Sentence16: What price range are you looking for? Sentence17: The archway house is in the north and 4 stars Sentence18: There are many places to choose from. Do you have a certain price range you want to stay in? How about free wifi and parking? Sentence19: Glad, I could help you plan your experience in cambridge, enjoy your day. Sentence20: I will be traveling soon and am excited about seeing some attractions. I am looking for a place to stay when I get there. Sentence21: That sounds great! What's their address and phone? And is that a hotel or a guesthouse? Sentence22: I have 2 cinemas. One is in the south. The other is in the centre of town. Which do you prefer? Sentence23: Thank you! I would like to stay in the North part of town, please. Sentence24: No that's all thank you for the help! Question: Who has spoken the sentence 21? (A) User (B) System
Output:
Answer: (B) System