This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Substance Abuse, Subject name: Psychiatry
[{'content': 'Most common psychiatric illness - \nSelect and explain. \nA. Depression, B. Bipolar, C. Mania, D. Cyclothymia', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Depressiono Depresson is the most common psychiatric disorder that affect 15% of the population at some time in their lives (Mates - 8-12%; Females -20-25%). Middle aged (25-45 years) females are most commonly affected.o Note : Among the given options, depression is most common. Overall, anxiety disorder is the most common psychiatric illness.", 'role': 'assistant'}]