**Core Concept**
Vitamin A deficiency is a condition characterized by inadequate levels of retinol or its derivatives, leading to impaired vision, immune function, and epithelial integrity. It is a significant public health concern in regions with limited access to nutrient-rich foods, particularly in children and pregnant women.

**Why the Correct Answer is Right**
Vitamin A deficiency is associated with night blindness, xerophthalmia, and increased risk of infections due to impaired epithelial barrier function. The primary mechanism involves the degradation of rhodopsin, a photopigment in the retina, leading to impaired visual function. Vitamin A also plays a crucial role in the maintenance of the epithelial lining, particularly in the respiratory, gastrointestinal, and genitourinary tracts.

**Why Each Wrong Option is Incorrect**
**Option A:** This option might be a correct statement regarding Vitamin A deficiency.
**Option B:** This option might be a correct statement regarding Vitamin A deficiency.
**Option C:** This option might be a correct statement regarding Vitamin A deficiency.

**Clinical Pearl / High-Yield Fact**
It is essential to note that Vitamin A deficiency can be prevented through dietary supplementation, particularly with retinol or beta-carotene, which is a precursor to retinol. In regions with limited access to nutrient-rich foods, Vitamin A supplementation programs have been implemented to reduce the incidence of Vitamin A deficiency-related complications.

**Correct Answer:** None of the above.