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
Amsler's grid is used in: 
Select and explain. 
A. Detecting colour vision, B. Retinal function test, C. Maculopathy, D. Refractive errors
C: Maculopathy
Answer: C: Maculopathy 
Explanation: Ans. Maculopathy