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
[{'content': 'Which of the following does NOT scavenge free radicals in the lens? \nSelect and explain. \nA. Vit A, B. Vit C, C. Vit E, D. Catalase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Vitamin A Repeat from - May 08 & May 07 Antioxidant mechanisms within lens - Superoxide dismutase - Glutathione peroxidase - Catalase - Vitamin C (Ascorbic acid) - Vitamin E', 'role': 'assistant'}]