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
The procedure preferred for periodontal surgery in mandibular anterior teeth is 
Select and explain. 
A. Gingivectomy, B. Periodontal flap, C. Subgingival curettage, D. Grafting
B: Periodontal flap
Answer: B: Periodontal flap 
Explanation: None