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: Pathology
Among the following conditions of hypercalcemia, PTH is not elevated in 
Select and explain. 
A. Parathyroid adenoma, B. Familial hypocalciuric hypercalcemia, C. Parathyroid hyperplasia, D. Sarcoidosis
D: Sarcoidosis
Answer: D: Sarcoidosis 
Explanation: In individuals with primary hyperparathyroidism, serum PTH levels are inappropriately elevated for the level of serum calcium, whereas PTH levels are low to undetectable in hypercalcemia caused by of non-parathyroid diseasesSarcoidosis is a non-parathyroid cause of hypercalcemiaFamilial hypocalciuric hypercalcemia, a rare autosomal dominant disorder caused by loss-of-function mutations in the parathyroid calcium-sensing receptor gene (CASR), which results in decreased sensitivity to extracellular calcium. PTH is elevated.Robbins pathology 9e pg: 1103