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

Sentence1: Good bye! Enjoy! Sentence2: I recommend the Carolina Bed & Breakfast. It has free parking and wifi, and it's located at 138 Perne Road, cb13nx. Sentence3: I'd like to find something in the east, preferably with 4 stars. Sentence4: No that will be it! Thank you! Sentence5: Thank you. Good-bye. Sentence6: Thanks. I also need a guesthouse to stay in that is in the moderate price range. Sentence7: The museum of classical archaeology is located in the west at sidgwick avenue. They have a free entrance fee. Sentence8: Thank you for using our services. Have all of your needs been met today? Sentence9: i'm looking for museums in town Sentence10: None in particular can you just pick one and give me the address please? Sentence11: Hope you enjoy your stay in Cambridge! Sentence12: Here you go. Do you need anything else. 01223247015 Sentence13: Cambridge has a variety of museums in all sections of town. Let's narrow your search. Is there a part of town or a type of museum you are interested in? Sentence14: That sounds great! What's their phone number? Sentence15: Yes. That's all I need. Thanks. Sentence16: I have several guesthouses in the moderate range available. What area of town would you prefer? Question: Who has spoken the sentence 11? (A) User (B) System
Answer: (B) System