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
The benign neoplasm of 'brown fat' noted in oral/ pharyngeal region is: 
Select and explain. 
A. Lipoma, B. Hibernoma, C. Teratoma, D. Brown tumor
B: Hibernoma
Answer: B: Hibernoma 
Explanation: None