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
Which does NOT handle free radicals inside lens - 
Select and explain. 
A. Vitamin A, B. Vitamin C, C. Vitamin E, D. Catalase
A: Vitamin A
Answer: A: Vitamin A 
Explanation: Preventive antioxidant mechanisms of lens against free radicals are: Enzymatic defence mechanism - reduced glutathione, glutathione peroxide, superoxide dismutase and catalase Non-enzymatic defence mechanism - vitamin C, vitamin E and carotenoids