This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnosis and Treatment of Retina, Subject name: Ophthalmology
Most impoant factor for development of diabetic retinopathy is 
Select and explain. 
A. Duration of diabetes, B. Level of diabetes, C. Type of diabetes, D. co morbid conditions like hypeension & hyperlipidemia
A: Duration of diabetes
Answer: A: Duration of diabetes 
Explanation: Duration of diabetes is most impoant factor for development of diabetic retinopathy. Other Risk Factors: Duration of DM Hyperlipidemia Nephropathy Pregnancy Hypeension