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': 'ETDRS vision chart study is done in patients with diabetic retinopathy. ETDRS stands for – \nSelect and explain. \nA. Extended therapy for diabetic retinopathy & its sutdy, B. Emergency treatment for diabetic retinopathy and study, C. Eye testing or rotatory drum & its study, D. Early treatment for diabetic retinopathy study', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Early treatment diabetic retinopathy study (ETDRS) was a multicenter, randomized clinical trial involving 3711 participants designed to evaluate the effectiveness of both organ laser photocoagulation and aspirin therapy in the management of patients with non-proliferative diabetic retinopathy and early proliferative diabetic retinopathy.\nIn addition, it was designed to determine the best time to initiate photocoagulation treatment in diabetic retinopathy.', 'role': 'assistant'}]