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': 'Retinoscopy is used for visualising the: \nSelect and explain. \nA. Whole retina, B. Only the peripheral pa of the retina, C. Detecting errors of refraction, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Detecting errors of refraction', 'role': 'assistant'}]