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
[{'content': 'One of the following is NOT a sign of diabetic retinopathy – \nSelect and explain. \nA. Microaneurysms, B. Cotton wool spots, C. Hard exudates, D. Choroidal neovascularization', 'role': 'user'}, {'content': 'Answer: D \nExplanation: There is retinal neovascularization (not choroidal).', 'role': 'assistant'}]