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: Ophthalmology
[{'content': 'Degree of diabetic retinopathy depends on – \nSelect and explain. \nA. Type of disease, B. Duration of disease, C. Severity of disease, D. Retinal involvement', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Risk factors for diabetic retinopathy \n\nDuration of disease after onset of puberty :- Most important risk factor.\nOther :- Age of onset (before puberty), sex, poor glycemic control, hypertension, smoking, poor renal status, obesity, hyperlipidemia, pregnancy.', 'role': 'assistant'}]