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QUESTION
Q252) Which one is associated with vitamin D ...[Tamil nadu 2001 ]

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Ergosterol is a compound present in ergot and many other fungi. A steroid alcohol, it is converted to vitamin D2 when irradiated with ultraviolet light. synthesis of vitamin D (specifically cholecalciferol) in the skin is the major natural source of the vitamin.
Vitamin D is made in the skin from cholesterol dependent on sun exposure (specifically UVB radiation).
Answer : (d)