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': 'Maximum refractive power is due to the \nSelect and explain. \nA. Anterior surface of lens, B. Posterior surface of lens, C. Anterior surface of cornea, D. Posterior surface of cornea', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Anterior surface of cornea', 'role': 'assistant'}]