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
Which of the following has greatest impact on success of
a periodontal flap procedure? 
Select and explain. 
A. Level of postoperative plaque control, B. Level of flap at closure, C. Extent to which flap is reflected, D. Type of incision
A: Level of postoperative plaque control
Answer: A: Level of postoperative plaque control 
Explanation: None