This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Calcitonin causes hypocalcemia by: 
Select and explain. 
A. Inhibiting bone resorption, B. Promoting osteolysis, C. Decreasing renal tubular reabsorption of calcium, D. Decreasing absorption of phosphorus
A: Inhibiting bone resorption
Answer: A: Inhibiting bone resorption 
Explanation: None