This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Musculoskeletal Radiology, Subject name: Radiology
[{'content': 'Sacrotuberous ligament calcification is a characteristic feature of? \nSelect and explain. \nA. Alkaptonuria, B. Osteopetrosis, C. Fluorosis, D. Pseudogout', 'role': 'user'}, {'content': 'Answer: C \nExplanation: - Calcification of sacrotuberous ligament,interosseous ligaments is characteristic of Fluorosis', 'role': 'assistant'}]