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
Radius of curvature of the anterior surface of an adult crystalline lens with accommodation at rest is: 
Select and explain. 
A. 7 mm, B. 10 mm, C. 8 mm, D. 9 mm
B: 10 mm
Answer: B: 10 mm 
Explanation: Ans. 10 mm