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
Treatment modalities which are carried out to cure ANUG are all except: 
Select and explain. 
A. 3%H2O2., B. Gingivoplasty., C. Gingivectomy., D. None.
C: Gingivectomy.
Answer: C: Gingivectomy. 
Explanation: None