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: Thank you, that is all I need. Goodbye. Sentence2: I've been robbed. Can I get some help? Sentence3: Please contact the Parkside, Cambridge police station, the telephone number is 01223358966. Sentence4: You are welcome. Do you need any further assistance? Question: Who has spoken the sentence 3? (A) User (B) System
Output:
Answer: (B) System