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
Dysthymia is - 
Select and explain. 
A. Chronic mild depression, B. Chronic severe depression, C. Bipolar disorder, D. Personality disorder
A: Chronic mild depression
Answer: A: Chronic mild depression 
Explanation: Mild depression with the chronic course (≥ 2 years) is called dysthymia.