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
Kirkland and orban knives are used for 
Select and explain. 
A. Curettage, B. Gingivectomy, C. Root planning, D. Scaling
B: Gingivectomy
Answer: B: Gingivectomy 
Explanation: None