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: Social & Preventive Medicine
[{'content': 'All of the following are antioxidant except:September 2005 \nSelect and explain. \nA. Vitamin A, B. Vitamin B, C. Vitamin C, D. Vitamin E', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: Vitamin BAntioxidants are a group of compounds that help to protect the body from the formation and elimination of free radicals. Free-radicals are formed from exposure to sunlight and pollution and also as a byproduct of cell metabolism. Alcohol, cigarette smoke, stress and even diet also affect the level of free-radical development in the body. Excellent antioxidants include Vitamin A, Vitamin E, Vitamin C, zinc, selenium, ginkgo biloba, grape seed extract, and green tea extract.', 'role': 'assistant'}]