Which of the following acids is a vitamin ?

<p><strong>Correct Answer: Ascorbic Acid</strong></p> <p>Ascorbic acid is commonly known as Vitamin C. It is a water-soluble vitamin essential for various bodily functions, including:</p> <p><p>$\textbf{Antioxidant Function:}$ It helps protect cells from damage caused by free radicals.</p></p> <p><p>$\textbf{Collagen Synthesis:}$ It is crucial for the formation of collagen, a protein necessary for skin, cartilage, tendons, ligaments, and blood vessels.</p></p> <p><p>$\textbf{Immune Support:}$ It supports the immune system by enhancing the body's natural defenses.</p></p> <p><p>$\textbf{Iron Absorption:}$ It improves the absorption of non-heme iron from plant-based foods.</p></p> <p>Among the given options, only ascorbic acid qualifies as a vitamin.</p>