This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumors, Subject name: Orthopaedics
Brown tumour is seen in 
Select and explain. 
A. Hyperparathyroidism, B. Hypoparathyroidism, C. Hypothyroidism, D. Hypehyroidism
A: Hyperparathyroidism
Answer: A: Hyperparathyroidism 
Explanation: Brown's tumour: This is an expansile bone lesion, a collection of osteoclasts. It commonly affects the maxilla or mandible, though any bone may be affected. Commonly seen in Hyperpathyroidism Ref: Maheshwari 6e pg 313.