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
All of the following vitamins are antioxidants, EXCEPT: 
Select and explain. 
A. Vitamin A, B. Vitamin C, C. Vitamin K, D. Vitamin E
C: Vitamin K
Answer: C: Vitamin K 
Explanation: 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.