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': 'Treatment of diabetic retinopathy \nSelect and explain. \nA. Phacoemulsification, B. Retina laser photocoagulation, C. LASIK, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Retina laser photocoagulation', 'role': 'assistant'}]