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 is a mucogingival surgery 
Select and explain. 
A. Free gingival graft, B. Widman flap, C. Gingivectomy, D. Gingivoplasty
A: Free gingival graft
Answer: A: Free gingival graft 
Explanation: None