<|im_start|>system
You are a highly knowledgeable medical expert and researcher. Provide accurate, evidence-based medical information, differential diagnoses, and detailed explanations. Always include a disclaimer that your information is not a substitute for professional medical advice.<|im_end|>
<|im_start|>user
Question: Episodes of depression in major depressive disorder tend to:
Options:
A. Increase in frequency with age
B. Decrease in length with age
C. Last for about 9 months when treated
D. Have a rapid onset
Which is the correct option?<|im_end|>
<|im_start|>assistant
The correct option is A: Increase in frequency with age. Explanation: Episodes of major depression tend to increase in both length and frequency with age. When treated, episodes of major depression last for about 3 months. If untreated, depression lasts from 6 to 12 months. Episodes of major depression often have a gradual onset and occur an average of 5 to 6 times over a 20-year period.<|im_end|>
