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
[{'content': 'Paricalcitol is FDA-approved for which of the following condition(s): \nSelect and explain. \nA. Rickets, B. Osteomalacia, C. Primary hyperparathyroidism, D. Secondary hyperparathyroidism', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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', 'role': 'assistant'}]