Question

Which vitamin is provided by sunlight to the body?

• A. Vitamin A
• B. Vitamin B
• C. Vitamin C
• D. Vitamin D

Hint:

Ultraviolet rays in sunlight convert a compound in the skin into Vitamin D.

Answer 1

The Correct Option is D

Step 1: Recall how the body can make its own Vitamin D.
Most vitamins must come entirely from food because the human body cannot make them on its own. Vitamin D is the one exception among common vitamins: the skin contains a compound that changes into Vitamin D when it is struck by ultraviolet rays from sunlight.

Step 2: Understand the process in a little more detail.
When sunlight hits the skin, ultraviolet B rays convert a cholesterol related compound present in the skin into an inactive form of Vitamin D. This inactive form then travels to the liver and kidney, where it is converted into the active form the body actually uses to help absorb calcium and build strong bones. This is why Vitamin D is nicknamed the "sunshine vitamin."

Step 3: Check why the other vitamins do not fit.
Vitamin A mainly comes from food sources such as carrots, liver, and dairy, and supports vision and skin health; sunlight plays no part in making it.
Vitamin B is actually a group of several vitamins obtained from grains, pulses, and meat, mostly used in energy metabolism; none of them are produced through sunlight exposure.
Vitamin C comes from citrus fruits and vegetables and helps with collagen formation and immunity; the body cannot make it from sunlight either.

Step 4: Final answer.
Sunlight uniquely triggers the skin to make Vitamin D, so that is the correct choice.
\[ \boxed{\text{Vitamin D}} \]