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
Among the following, which is the most effective antioxidant: 
Select and explain. 
A. Vitamin A, B. Vitamin C, C. Vitamin E, D. Vitamin K
C: Vitamin E
Answer: C: Vitamin E 
Explanation: Ans. (c) Vitamin ERef: Harper's Biochemistry, 30th ed. pg. 553, 564* Vitamin E has many biological functions, the antioxidant function being the most important and/or best known.* Other functions include:# Enzymatic activities# Gene expression# Neurological function and# Cell signaling* As an antioxidant, vitamin E acts as a peroxyl radical scavenger, preventing the propagation of free radicals in tissues.* It does so by reacting with ROS to form a tocopheryl radical, which will then be reduced by a hydrogen donor (such as vitamin C) to its reduced state. As it is fat- soluble, it is incorporated into cell membranes, which protects them from oxidative damage.