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
Which of the following is not antioxidant ? 
Select and explain. 
A. Micronutrients like Iron, B. Vitamins like C and E, C. Enzymes like glutathione peroxidase, superoxide dismutase, D. Transport proteins like transferrin, Ceruloplasmin
A: Micronutrients like Iron
Answer: A: Micronutrients like Iron 
Explanation: Transition metals like Iron and Copper generate free radicals and increase oxidative stress.