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: Dental
An isolated area in which root is denuded of bone is intact and covered only by periosteum and overlying gingiva is called 
Select and explain. 
A. Fenestration, B. Dehiscence, C. Infracrestal pocket, D. Hemiseptum defect
A: Fenestration
Answer: A: Fenestration 
Explanation: None