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
Technique of root coverage called as: 
Select and explain. 
A. Langer and langer technique, B. Pouch and tunnel technique., C. Azis technique., D. Bruno technique
B: Pouch and tunnel technique.
Answer: B: Pouch and tunnel technique. 
Explanation: None