**Question:** Vitamin E is -

A. Antioxidant
B. Vasodilator
C. Enzyme
D. Antibiotic

**Core Concept:** Vitamin E is a fat-soluble vitamin that plays a crucial role as an antioxidant in the body, protecting cell membranes and other biomolecules from oxidative damage. It is essential for maintaining the integrity of cellular membranes and preventing cellular dysfunction caused by free radicals.

**Why the Correct Answer is Right:** Vitamin E is indeed an antioxidant, specifically an α-tocopherol, which is a type of tocopherol. Tocopherols are lipid-soluble compounds that act as chain-breaking antioxidants, scavenging reactive oxygen species (ROS) and preventing lipid peroxidation. This action helps maintain the integrity of cell membranes and prevents cellular dysfunction.

**Why Each Wrong Option is Incorrect:**

A. Antioxidant (Correct) - Vitamin E functions as an antioxidant, protecting cells from oxidative damage.
B. Vasodilator - Vitamin E does not have vasodilatory properties; it is primarily known for its antioxidant role.
C. Enzyme - Vitamin E is not an enzyme; it is a fat-soluble vitamin.
D. Antibiotic - Vitamin E is not a antibiotic; it serves a different role in the body as an antioxidant and membrane stabilizer.

**Clinical Pearl:** Vitamin E deficiency can lead to various health issues, including impaired immune function and increased susceptibility to infections. Ensuring adequate vitamin E intake is crucial for maintaining cellular health and preventing oxidative damage.

**Correct Answer:** A. Antioxidant

Vitamin E is an essential antioxidant that plays a vital role in protecting cells from oxidative stress and maintaining cell membrane integrity.