This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition & Digestion, Subject name: Biochemistry
[{'content': 'The proxidant action of Vitamin C is potentiated by: \nSelect and explain. \nA. Selenium, B. Copper, C. Calcium, D. Iron', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. Copper(Ref: Harper 31/e page 533-540)Ascorbate is antioxidant, but it can be a source of hydroxyl radical by reacting with Cu2+ ions. Antioxidant vitamins that can act as prooxidants are:Beta caroteneAscorbateTocopherol', 'role': 'assistant'}]