Osteoclasts are inhibited by:: (A) Parathyroid hormone, (B) Calcitonin, (C) 1,25-dihydroxycholecalciferol, (D) Tumor necrosis factor
Answer is B. Calcitonin inhibits bone resorption by direct action on osteoclasts. Ref: Ganong's Review of Medical Physiology, 21st Edition, Page 397