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: Pathology
[{'content': 'Which of the following is not antioxidant ? \nSelect and explain. \nA. Micronutrients like Iron, B. Vitamins like C and E, C. Enzymes like glutathione peroxidase, superoxide dismutase, D. Transport proteins like transferrin, Ceruloplasmin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Transition metals like Iron and Copper generate free radicals and increase oxidative stress.', 'role': 'assistant'}]