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
Which of the following technique is not based on the buccal flaps in the management of oro-antral fistula? 
Select and explain. 
A. Rehrmann Flap, B. Ashley Flap, C. Moczain Flap, D. Burger Flap
B: Ashley Flap
Answer: B: Ashley Flap 
Explanation: None