This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET Jan 2020, Subject name: Medicine
[{'content': "What is the first line of drug for post-menopausal Osteoporosis? \nSelect and explain. \nA. Raloxifene, B. Oestrogen, C. Bisphosphonates, D. Combined OCP's", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Treatment of post-menopausal Osteoporosis : Bisphosphonates First-line therapy. They increase bone density and reduce the risk for spine, hip and non-veebral fractures. Synthetic analogues of pyrophosphate that bind to the hydroxyapatite in bone and inhibit osteoclastic bone resorption.', 'role': 'assistant'}]