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
Dr Bernhard Giesenhagen gave which of the following 
Select and explain. 
A. Bone ring technique, B. Bone flap technique, C. Overlap technique, D. Bone pouch technique
A: Bone ring technique
Answer: A: Bone ring technique 
Explanation: None