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': 'Treatment of presbyopia – \nSelect and explain. \nA. LASIK, B. Concave lens, C. Convex lens, D. Radial keratotomy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]