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: Surgery
[{'content': 'Brown Tumor is seen in: \nSelect and explain. \nA. Hypothyroidism, B. Hypehyroidism, C. Hypoparathyroidism, D. Hyperparathyroidism', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Brown tumor is usually seen in excess osteoclastic activities, such as hyperparathyroidism. It is a repairative process rather than neoplastic. In hyperparathyroidism there is excess parathyroid hormone (PTH) secreted, which leads to excess calcium resorption from the bones leading to "ostitis fibrosa cystica". Ref: Harrison\'s Principles of Internal Medicine, 17th Edition, Page 1765; Robbins Pathologic Basis of Disease, 8th Edition, Pages 1218, 1128.', 'role': 'assistant'}]