This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Retina, Subject name: Ophthalmology
[{'content': 'Which of the following is characterstic sign of diabetic retinopathy? \nSelect and explain. \nA. Increase in pericytes, B. Thinned out capillary basement membrane, C. Lipohyaline deposits, D. Proliferation of endothelial cells', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The pathogenesis of Diabetic retinopathy is microangiopathy which occurs due to microvascular occlusion & leakage. There is degeneration and loss of pericytes in capillaries--> microvascular proliferation of endothelial cells -->thickening of basement membrane-->narrowed lumen of vessels.', 'role': 'assistant'}]