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

Sentence1: Thank you for using our services. Sentence2: Call 01223358966 for the Parkside Police Station to help you. Sentence3: What's the address, please? Sentence4: There is no specific street number, but I'm sure if you go to Parkside, Cambridge at postcode CB11JG you'll be able to locate the station. Sentence5: I was just robbed and am looking for help. Can you give me the phone number for the police? Sentence6: Thank you for your help. That is all I need. Question: Who has spoken the sentence 5? (A) User (B) System
Answer: (B) System