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': 'DSM IV criterion for depression is? \nSelect and explain. \nA. 1 week, B. 2 weeks, C. 3 weeks, D. 4 weeks', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. 2 weeksFor the diagnosis of minor depression 2-4 and for major depression > 5 DSM IV symptoms are required for at least for a two week period.', 'role': 'assistant'}]