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 component of the eye has maximum refreactive index: \nSelect and explain. \nA. Anterior surface of the lens, B. Posterior surface of the lens, C. Centre of the lens, D. Cornea', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Centre of the lens [Ref: Parson 20/e p52, 53, and 59J Repeat. from May10', 'role': 'assistant'}]