This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Optics and refraction, Subject name: Ophthalmology
[{'content': 'With accommodation at rest, total refractory power of crystalline lens is - \nSelect and explain. \nA. 14D, B. 16D, C. 18D, D. 20D', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The diopteric power of reduced eye is +60D, of which +44D is contributed by cornea and +16D by the crystalline lens. Reference: Optics and refraction AK Khurana 7th edition page 31', 'role': 'assistant'}]