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
Both decreased bone resorption and increased bone formation is caused by 
Select and explain. 
A. Strontium ranelate, B. Ibadronate, C. Teriparatide, D. calcitonin
A: Strontium ranelate
Answer: A: Strontium ranelate 
Explanation: It supresses bone resorption as well as stimulates bone formation and has been introduced as a reserve drug for elderly women who have already suffered osteoporotic fracture and are unable to tolerate BPNs.(Ref.Essentials of medical pharmacology TD Tripathi 7th edition page no.346)