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
True about presbopia 
Select and explain. 
A. Age related defect of refraction, B. Defect in accommodation, C. Concave lens used, D. All
B: Defect in accommodation
Answer: B: Defect in accommodation 
Explanation: B i.e. Defect in accommodation