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160936 Medicine

A 72-year-old man is recently found to have hypocalcemia and Osteomalacia is suspected based on the decrease in the cortical bone thickness and osteopenia seen on x-rays. Which of the following is the most likely mechanism of the resistance to the effects of vitamin D?

Aexcess parathyroid hormone secretion
Binsufficient parathyroid hormone secretion
Cdefective receptors for 25(OH) vitamin D
Ddefective receptors for 1,25OH2 vitamin D (Correct Answer)