This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
[{'content': 'Refraction at anterior surface cornea is maximum because \nSelect and explain. \nA. Anterior surface of cornea has smaller curvature, B. There is greater difference between refractive indices of air & cornea, C. It is avascular transparent tissue, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: .', 'role': 'assistant'}]