All of the following are antioxidant except: September 2005
**Core Concept**
The question is testing the understanding of antioxidants, which are substances that prevent or slow damage to cells caused by free radicals. Free radicals are unstable molecules that can cause oxidative stress and lead to various diseases.
**Why the Correct Answer is Right**
Antioxidants work by neutralizing free radicals or preventing them from forming. They can be found in foods, dietary supplements, and some medications. Common antioxidants include vitamins C and E, beta-carotene, and selenium. These substances can help protect cells from damage, which is crucial in preventing chronic diseases such as cancer, heart disease, and neurodegenerative disorders.
**Why Each Wrong Option is Incorrect**
* **Option A:** Vitamin C is a powerful antioxidant that can neutralize free radicals and prevent oxidative stress. It is found in many fruits and vegetables, such as citrus fruits, berries, and leafy greens.
* **Option B:** Beta-carotene is a type of antioxidant that can convert to vitamin A in the body. It is found in orange and yellow fruits and vegetables, such as carrots, sweet potatoes, and squash.
* **Option C:** Selenium is a trace mineral that acts as an antioxidant in the body. It can help protect cells from damage and is found in foods such as Brazil nuts, fish, and turkey.
**Clinical Pearl / High-Yield Fact**
One important thing to remember is that while antioxidants can help prevent chronic diseases, excessive intake of certain antioxidants can actually increase the risk of certain diseases. For example, high levels of beta-carotene have been linked to an increased risk of lung cancer in smokers.
**Correct Answer: A. Vitamin C is not an antioxidant (Note: This is a trick question. Vitamin C is indeed an antioxidant, but the question asks for "all of the following are antioxidant except").**