This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Major Depression, Subject name: Psychiatry
Minimum time period to diagnose depression with daily manifestation is? 
Select and explain. 
A. 1 weeks, B. 2 weeks, C. 4 weeks, D. 8 weeks
B: 2 weeks
Answer: B: 2 weeks 
Explanation: Ans. (b) 2 weeks(Ref. Kaplan and sadock's synopsis of psychiatry: behavioral sciences/Clinical psychiatry, 10/e, American psychiatric Association, Diagnostic and statistical menual of mental disorders, 4/e