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
Indication of gingivectomy is 
Select and explain. 
A. edema of gingiva, B. infrabony pockets, C. adequate attached gingiva, D. pocket depth below mucogingival junction
C: adequate attached gingiva
Answer: C: adequate attached gingiva 
Explanation: None