This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Orthopaedics
[{'content': "Hyperparathyroidism causes - \nSelect and explain. \nA. Multiple bone cysts, B. Subperiosteal bone resorption, C. Brown's tumor, D. All of the above", 'role': 'user'}, {'content': "Answer: D \nExplanation: Radiological features of bone are : Rarefaction of bones, salt pepper skull, loss of lamina dura, sub-periosteal resorption of bone, multiple cysts, Brown's tumor, and collapse of vertebrae with biconvex disc.", 'role': 'assistant'}]