Vitamin D is created from _________ by skin cellsA. DehydrocholesterolB. CholesterolC. HydrocholesterolD. Hydrodermis

I agree with lachicdina's post
above.

Vitamin D is created from exposure of the sun to
ultraviolet light (UV).  Vitamin D3 is created in the skin when Dehydrocholesterol-7
(Answer A) reacts with ultraviolet light.

To explain
dehydrocholesteral a bit further...it is a type of cholesterol in the skin that responds
to ultraviolet light when the sun hits the skin. It is then converted into Vitamin
D3.

*Fun Facts about this topic: Vitamin D is essential for
life in higher animals! It must be supplied in the diet on a regular basis (most of us
get it automatically just from our diet and/or being exposed to the sun--however, if you
live in say, Alaska or other parts of the world that do not receive adequate
sunlight--you may require additional supplements.) Insufficient vitamin D can result in
Rickets.