Fat soluble vitamin with antioxidant effect –
**Core Concept**
Vitamin E, a fat-soluble vitamin, plays a crucial role as an antioxidant in the human body. It protects cell membranes from oxidative damage by neutralizing free radicals.
**Why the Correct Answer is Right**
Vitamin E, specifically alpha-tocopherol, acts as a chain-breaking antioxidant by donating a hydrogen atom to lipid radicals, thereby preventing the propagation of lipid peroxidation. This mechanism is essential in protecting cell membranes from oxidative damage, which can lead to cell death and tissue damage. Vitamin E also has a role in the regulation of immune function and inflammation.
**Why Each Wrong Option is Incorrect**
* **Option A:** While Vitamin C is also an antioxidant, it is water-soluble, not fat-soluble.
* **Option B:** Vitamin A is a fat-soluble vitamin, but its primary function is in vision, immune function, and reproduction, not as an antioxidant.
* **Option C:** Vitamin K is a fat-soluble vitamin, but its primary function is in blood coagulation, not as an antioxidant.
**Clinical Pearl / High-Yield Fact**
Vitamin E deficiency can lead to neurodegenerative diseases, such as ataxia with vitamin E deficiency (AVED), which is characterized by progressive ataxia, dysarthria, and loss of proprioception.
**Correct Answer:** D. Vitamin E