A) cholesterol
B) 7-hydroxy cholesterol
C) cephalin cholesterol
D) all of the above
Correct Answer: B
Solution :
Vitamin-D is a steroid which is synthesized from cholesterol. Vitamin-D2 is formed from plant sterol, ergosterol which occurs in yeast and other fungi in the presence of ultraviolet light. Vitamin-D3 formed from animal sterol, 7-dehydroxy cholesterol, which occurs in animal skin. Its synthesis also needs ultraviolet light.
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