This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
[{'content': 'Sleep pattern seen in mania is \nSelect and explain. \nA. Hypersomnia, B. Insomnia, C. Decreased need for sleep, D. Somnambuslism', 'role': 'user'}, {'content': 'Answer: C \nExplanation: A person in mania is hyperactive so that he has decreased need for sleep.', 'role': 'assistant'}]