Skin cells play an important role in producing which fat-soluble vitamin when exposed to ultraviolet (UV) light?

• A. Vitamin D
• B. Vitamin E
• C. Vitamin K
• D. Vitamin A

Answer: (A)

Verified step by step guidance

1. Understand that the question is asking about the production of a fat-soluble vitamin by skin cells when exposed to ultraviolet (UV) light.
2. Recall that fat-soluble vitamins include Vitamins A, D, E, and K, each with different sources and functions in the body.
3. Recognize that Vitamin D is unique among these vitamins because it can be synthesized by the skin through a chemical reaction triggered by UV light exposure.
4. Know that the process involves 7-dehydrocholesterol in the skin converting to previtamin D3 when exposed to UVB rays, which then becomes active Vitamin D after further processing in the liver and kidneys.
5. Conclude that the vitamin produced by skin cells upon UV exposure is Vitamin D, distinguishing it from Vitamins A, E, and K, which are primarily obtained through diet.