Which vitamin can be synthesized by the body upon exposure to sunlight?

The body can synthesize Vitamin D when the skin is exposed to ultraviolet (UV) rays from sunlight. Specifically, the process begins when UV radiation converts cholesterol in the skin to previtamin D3, which is then transformed into vitamin D3 (cholecalciferol). This compound is subsequently metabolized into its active form, calcitriol, in the liver and kidneys. Vitamin D plays a crucial role in calcium homeostasis and bone health, as it enhances the absorption of calcium from the diet and encourages proper bone mineralization.

In contrast, other vitamins mentioned do not follow this light-dependent synthesis pathway. For example, Vitamin A is obtained primarily from dietary sources such as animal products and certain vegetables, while Vitamin E and Vitamin C are also sourced from food and are not produced naturally within the body through sunlight exposure. Thus, the unique ability of Vitamin D to be synthesized in response to sunlight exposure distinguishes it as the correct answer in this scenario.