16. Which statement regarding mineral metabolism in CKD is correct? 1.increased production of parathyroid hormone 2.reduced production of fibroblast growth factor-23 (FGF-23) 3.increased renal excretion of phosphate 4.reduced produce of 1,25-dihydroxyvitamin D3 [1,25(OH)2D3] 5.reduction in serum calcium
(A) 1+3+4+5
(B) 1+2+4
(C) 1+2+3+4
(D) 1+2+4+5
(E) 1+4+5