This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cornea and sclera, Subject name: Ophthalmology
[{'content': 'Most impoant factor in convergence of light rays on retina is \nSelect and explain. \nA. Length of eye ball, B. Dioptre power of lens, C. Centre of lens, D. Cornea', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Convergence of light rays on retina is due to cornea Ref khurana 6/e', 'role': 'assistant'}]