This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pituitary-Hypothalmic System and Thyroid, Subject name: Pharmacology
Paricalcitol is FDA-approved for which of the following condition(s): 
Select and explain. 
A. Rickets, B. Osteomalacia, C. Primary hyperparathyroidism, D. Secondary hyperparathyroidism
D: Secondary hyperparathyroidism
Answer: D: Secondary hyperparathyroidism 
Explanation: Paricalcitol: It is a synthetic calcitriol derivative Reduces serum PTH levels without producing hypercalcemia or altering serum phosphorus Administered orally or intravenously FDA-approved for treating secondary hyperparathyroidism in patients with CKD