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': 'Brown a tumour is seen in \nSelect and explain. \nA. Hypothyroidism, B. Hyperparathyroidism, C. none, D. all of the above', 'role': 'user'}, {'content': "Answer: B \nExplanation: Brown's tumour is seen in Hyperparathyroidism. \nIt's an expansile lytic lesion. This is a collection of osteoclasts.\nIt commonly found in maxilla and mandible, other bones also affected.\nOther features are multiple bone cysts, subperiosteal retraction of bones, salt and pepper appearance of the skull in X-ray.", 'role': 'assistant'}]