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
Gingivectomy is contraindicated in: 
Select and explain. 
A. Gingival hyperplasia, B. Suprabony defects, C. Infrabony pockets, D. Phenytoin induced gingival hyperplasia
C: Infrabony pockets
Answer: C: Infrabony pockets 
Explanation: None