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: B i.e. Duration of disease The presence & degree of diabetic retinopathy is more closely related to the duration of disease than to its severityQ. Duration of disease is the most impoant and best predictor Q of diabetic retinopathy. In diabetic retinopathy aeriolar changes consist of narrowing Q (not dilation) silver-wiring and obliteration resembling branch retinal aery occlusion. And venous changes are bending, looping and sausage like segmentation.