Which of the following is NOT an antioxidant vitamin that helps prevent cholesterol oxidation?

Vitamin E, Vitamin C, and beta-carotene are recognized for their roles as antioxidants, specifically in their ability to help prevent the oxidation of cholesterol, which is a crucial process that can lead to cardiovascular diseases. Vitamin E is particularly well-known for protecting cell membranes from oxidative damage, thereby playing a vital role in maintaining healthy cholesterol levels. Vitamin C also contributes to this effect, as it can regenerate other antioxidants and directly scavenge free radicals. Beta-carotene, a precursor to vitamin A, acts as an antioxidant, helping to combat oxidative stress.

While vitamin A has some antioxidant properties, its primary functions in the body relate more to vision, immune function, and skin health rather than the direct prevention of cholesterol oxidation. Therefore, it is considered less effective in this specific role compared to the other vitamins listed. The focus on vitamins specifically tied to preventing cholesterol oxidation makes vitamin A the option that stands apart from the others.