This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lens, Subject name: Ophthalmology
Water content in lens is- 
Select and explain. 
A. 64%, B. 35%, C. 1%, D. 28%
A: 64%
Answer: A: 64% 
Explanation: Water content of lens is 64%. Ref: Parson Ophthalmology 22nd/e p.261&21st/e p.256.