Which vitamin plays a critical role in the maintenance of the integrity of the epithelial cells and the mucous membranes?

A Vitamin A ✓
B Vitamin C
C Vitamin D
D Vitamin E

Explanation

Vitamin A is crucial for maintaining the integrity and function of epithelial cells, which form the lining of organs, glands, the skin, and the respiratory, urinary, and intestinal tracts. It also supports the health of mucous membranes.

Source

Guyton and Hall Textbook of Medical Physiology
Vitamins Nutrition Role of Vitamins in Epithelial Health Easy MEDICAL Confidence: high