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
Periodontal pocket wall between tooth and bone is 
Select and explain. 
A. Supra bony pocket, B. Intra bony pocket, C. Gingival pocket, D. Pseudo pocket
B: Intra bony pocket
Answer: B: Intra bony pocket 
Explanation: None