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
Both decreased bone resorption and increased bone formation are caused by: 
Select and explain. 
A. Strontium ranelate, B. Ibandronate, C. Teriparatide, D. Calcitonin
A: Strontium ranelate
Answer: A: Strontium ranelate 
Explanation: None