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': "Amsler's grid is used in: \nSelect and explain. \nA. Detecting colour vision, B. Retinal function test, C. Maculopathy, D. Refractive errors", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Maculopathy', 'role': 'assistant'}]