Untrue about vitamin D is_______________?
Correct answer: D. 25-hydroxycholecalciferol is used in treatment of renal failure
- A. UV light helps in formation
- B. Increased parathyroid hormone secretion is seen in renal failure
- C. Hydroxylation of 25-hydroxycholecalcitenol occurs in kidney
- D. 25-hydroxycholecalciferol is used in treatment of renal failure
Explanation
Renal failure reduces conversion of 25-hydroxyvitamin D to active 1,25-dihydroxyvitamin D, causing secondary hyperparathyroidism; treatment therefore uses active vitamin D analogues such as calcitriol, not 25-hydroxycholecalciferol. UV light and renal hydroxylation are valid parts of vitamin D physiology.
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