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': 'Earliest change in diabetic retinopathy is: \nSelect and explain. \nA. Hard exudate, B. Soft exudate, C. Dot haemorrhage, D. Microaneurysm', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. Microaneurysm', 'role': 'assistant'}]