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': 'Dysthymia is ? \nSelect and explain. \nA. Chronic depression, B. Chronic mania, C. Bipolar disorder, D. Personality disorder', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. Chronic depressionPersistent depressive disorder (Dysthymia)Depression may run a chronic course over years with fluctuation of mood interposed with symptom free intervals (less than 2 months).If symptoms persist for more than 2 years, they are referred to as persistent depressive disorder or dysthymia.', 'role': 'assistant'}]