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
Degree of diabetic retinopathy depends on – 
Select and explain. 
A. Type of disease, B. Duration of disease, C. Severity of disease, D. Retinal involvement
B: Duration of disease
Answer: B: Duration of disease 
Explanation: Risk factors for diabetic retinopathy 

Duration of disease after onset of puberty :- Most important risk factor.
Other :- Age of onset (before puberty), sex, poor glycemic control, hypertension, smoking, poor renal status, obesity, hyperlipidemia, pregnancy.