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': 'Pinhole can reduce refractive error up to - \nSelect and explain. \nA. 3 D, B. 1 D, C. 5 D, D. 10 D', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Pin-hole test: It helps in confirming whether the\xa0optical correction in the trial frame is correct or not.\nAn improvement in visual acuity while looking through\xa0a pinhole indicates that optical correction\xa0in the trial frame is incorrect.\nPPinholecan reduce refractive error upto\xa03 D.', 'role': 'assistant'}]