Which of the Following Is a Recent Finding on Vitamin

Which of the following is a recent finding on vitamin D nutrition in the elderly?

A) The capacity to self-synthesize vitamin D is high.
B) The skin's capacity to synthesize vitamin D is reduced.
C) The presence of atrophic gastritis reduces bioavailability of vitamin D.
D) Symptoms of vitamin D deficiency include dermatitis and diminished taste acidity.