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
Daily depressed mood for minimum ________ weeks is must to classify someone as suffering from major depression disease - 
Select and explain. 
A. 1, B. 2, C. 3, D. 4
B: 2
Answer: B: 2 
Explanation: Symptoms of depression should be present for at least 2 weeks.