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': 'Both decreased bone resorption and increased bone formation is caused by \nSelect and explain. \nA. Strontium ranelate, B. Ibadronate, C. Teriparatide, D. calcitonin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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)', 'role': 'assistant'}]