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 tumour is seen in - \nSelect and explain. \nA. Hypothyroidism, B. Hyperparathyroidism, C. Hypoparathyroidism, D. Hyperthyroidism', 'role': 'user'}, {'content': "Answer: B \nExplanation: Brown's tumour is seen in Hyperparathyroidism. Its an expansile lytic lesion.This is a collection of osteoclasts. It commonly found in maxilla and mandible,other bones also affected. Other featurs are muktiple bone cysts,subperiosteal retraction of bones,salt and pepper appearence of skull in X-ray.", 'role': 'assistant'}]