This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal system, Subject name: Radiology
[{'content': "Pathognomic feature of hyperparathyroidism - \nSelect and explain. \nA. Osteopenia, B. Loss of lamina dura, C. Brown's tumor, D. Sub periosteal resorption of phalanges", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Radiological features of hyperparathyroidism : The characteristic feature is subperiosteal resorption paicularly radial aspect of middle phalanx of middle and index finger. Loss of lamina dura Pepper pot skull Rugger jersy spine Brown tumor Soft tissue calcification', 'role': 'assistant'}]