This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Ophthalmology
[{'content': 'Amsler grid is used in \nSelect and explain. \nA. Detecting maculopathy, B. Optic disc examination, C. Squint, D. Retinal examination', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .', 'role': 'assistant'}]