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': 'During accommodation, there occurs decrease in the radius of curvature of the: \nSelect and explain. \nA. Anterior surface of the lens, B. Posterior surface of the lens, C. Both surfaces of the lens, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Both surfaces of the lens', 'role': 'assistant'}]