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
Brown's tumour is seen in: 
Select and explain. 
A. Hypehyroidism, B. Hyperparathyroidism, C. Osteoporosis, D. Osteogenesis imperfecta
B: Hyperparathyroidism
Answer: B: Hyperparathyroidism 
Explanation: Advanced primary hyperparathyroidism pathognomonic radiologic findings, which are best seen on x-rays of the hands and are characterized by subperiosteal resorption. The skull also may be affected and appears mottled with a loss of definition of the inner and outer coices. Brown or osteoclastic tumors and bone cysts also may be present. Ref: Schwaz's principle of surgery 9th edition, chapter 38.