<prompt> Which of the following is true about secondary hyperparathyroidism?Commonly occurs in CRFRelated to hyperphosphatemiaPatients are generally hypocalcemicAll of the above  <response>: SECONDARY HYPERPARATHYROIDISM-MC cause is Chronic renal failure-May occur in hypocalcemia secondary to inadequate calcium or vitamin D intake, or malabsorption.-Related to hyperphosphatemia and resultant hypocalcemia-Deficiency of 1,25-dihydroxy vitamin D due to loss of renal tissue-Low calcium intake-Decreased calcium absorption 