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': 'True about presbopia \nSelect and explain. \nA. Age related defect of refraction, B. Defect in accommodation, C. Concave lens used, D. All', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Defect in accommodation', 'role': 'assistant'}]