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': 'Duration needed to diagnose hypomania is \nSelect and explain. \nA. 1 day, B. 4 day, C. 1 week, D. 2 weeks', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Symptoms of elevated mood should be present for 4 days to diagnose as hypomania.', 'role': 'assistant'}]