This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins and Minerals, Subject name: Biochemistry
[{'content': 'All of the following vitamins are antioxidants, EXCEPT: \nSelect and explain. \nA. Vitamin A, B. Vitamin C, C. Vitamin K, D. Vitamin E', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Remember the antioxidant vitamins by the mnemonic ACE or CEA. Note that it is the b carotene form of Vitamin A. b-carotene and vitamin E are lipid phase anti-oxidant. Vitamin C is an aqueous phase antioxidant. Extra Edge: Vitamin E is a chain breaking antioxidant.', 'role': 'assistant'}]