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: The lens is composed of 64% water, 35% protein, and 1% lipid, carbohydrate and trace elements.