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
[{'content': 'Most impoant factor for development of diabetic retinopathy is \nSelect and explain. \nA. Duration of diabetes, B. Level of diabetes, C. Type of diabetes, D. co morbid conditions like hypeension & hyperlipidemia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Duration of diabetes is most impoant factor for development of diabetic retinopathy. Other Risk Factors: Duration of DM Hyperlipidemia Nephropathy Pregnancy Hypeension', 'role': 'assistant'}]