This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mood Disorders, Subject name: Psychiatry
Chronic mild depression of how much duration is considered to be dysthymia? 
Select and explain. 
A. 3 to 6 months, B. 6 Months to 1 year, C. One to one and half years, D. More than 2 years
D: More than 2 years
Answer: D: More than 2 years 
Explanation: Ans. D. More than 2 yearsDysthymia: It's presence of mild depressive symptoms (not enough to diagnose a MDD) for a period of at least 2 years - socio-occupational dysfunction is not markedIn DSM-5: persistent depressive disorder (clubbed chronic depression + dysthymia)