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': 'Which presbyopic lens is used for 45 year old emmetropic individual? \nSelect and explain. \nA. +0.5D, B. +1.0D, C. +1.5D, D. +2.0D', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Rough estimate for presbyopic add\n45 yrs : +1.00 to +1.35 D\n50 yrs : +1.50 to +1.75 D\n55 yrs : +2.00 to +2.25 D', 'role': 'assistant'}]