This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrine System, Subject name: Physiology
[{'content': 'Osteoclast has specific receptor for: \nSelect and explain. \nA. Parathyroid hormone, B. Calcitonin, C. Thyroxin, D. Vit D3', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Calcitonin receptor is expressed in osteoclasts. Calcitonin inhibits bone resorption by inhibiting osteoclasts; and promotes Ca2+ from blood to be deposited on the bone. This decreases blood Ca2+. PTH is a primary endocrine regulator of bone remodeling in adults. The PTH/PTHrP receptor is expressed on osteoblasts, but not on osteoclasts.', 'role': 'assistant'}]