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
Diameter of an adult crystalline lens is: 
Select and explain. 
A. 5-6 mm, B. 7-8 mm, C. 9-10 mm, D. 11-12 mm
C: 9-10 mm
Answer: C: 9-10 mm 
Explanation: Ans. 11-12 mm