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: Biochemistry
[{'content': 'Most impoant vitamin which prevent autooxidation of PUFA in membrane ? \nSelect and explain. \nA. Tocopherol, B. Ascorbate, C. Retinol, D. Calcitriol', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Tocopherol Amongst given options, vitamin A, E and C are anti-oxidants.However, Vitamin E (tocopherol) is the most impoant antioxidant in the body, acting in the lipid phase of membranes protecting against the effects of free radicals.The main function of vitamin E is as a chain-breaking, free radical-trapping antioxidant in cell membranes and plasma lipoproteins by reacting with lipid peroxide radicals formed by peroxidation of polyunsatured fatty acid.", 'role': 'assistant'}]