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': 'Curvature of cornea can be measured by – \nSelect and explain. \nA. Keratometry, B. Direct ophthalmoscopy, C. Retino scopy, D. Perimetry', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]