This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Physiology
Calcitriol causes all except 
Select and explain. 
A. Increases renal tubular reabsorption of Ca2+, B. Reduce plasma Ca2+ concentration, C. Promotes intestinal absorption of Ca2+, D. Reduces Ca2+ resorption by bone
B: Reduce plasma Ca2+ concentration
Answer: B: Reduce plasma Ca2+ concentration 
Explanation: Calcitriol or 1,25 dihydroxycholecalciferol; a form of vitamin D used as a calcium regulator in the management of hypocalcemia in conditions such as rickets, osteodystrophy, hypoparathyroidism, and complications of renal dialysis; calcitriol promotes intestinal absorption of Ca2+, increases renal tubular reabsorption ofCa2+ and reduces Ca2+ resorption by bone.Ref: Ganong&;s review of medical physiology;24th edition; page no-380