Because multiple sclerosis is more common in regions of the world distant from the equator, there has been interest in the possible role of vitamin ________ in the disorder.
A) A
B) B
C) C
D) D
E) K

Question

Quizplus · Accepted Answer

Vitamin D is synthesized in the skin through exposure to sunlight, which is more abundant near the equator. Lower levels of sunlight exposure in regions farther from the equator may lead to lower levels of vitamin D, which has been hypothesized to play a role in the development of multiple sclerosis.

Because Multiple Sclerosis Is More Common in Regions of the World