This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrine, Subject name: Pharmacology
[{'content': 'The drug X is used in osteoporosis. Its mechanism of action is shown in the Figure below. X is likely to \nSelect and explain. \nA. Teriparatide, B. Alendronate, C. Denosumab, D. Estrogen', 'role': 'user'}, {'content': 'Answer: C \nExplanation: New drug for osteoporosis: 1. Teriparatide: PTH with 1-34 amino acid, stimulates osteoblast.2. Strontium ranelate: dual action: stimulate osteoblast and inhibit osteoclast.3. Denosumab: monoclonal antibody against rank ligand.', 'role': 'assistant'}]