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: Pharmacology
[{'content': 'Calicitonin causes hypocalcemia by \nSelect and explain. \nA. Inhibiting bone resorption, B. Promoting osteolysis, C. Decreasing renal tubular reabsorption of calcium, D. Decreasing absorption of phosphorus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Refer KDT 6/e p 330 Calcitonin inhibits bone resorption by direct action on osteoclasts Calcitonin recetpors are present on osteoclasts It also inhibits proximal tubular calcium and and phosphate reabsorption by direct action on kidney However hypocalcemia which occurs overrides the direct action by decreasing the total Ca2+ filtered at the Glomerulus', 'role': 'assistant'}]