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
The first instrument used on the facial surfaces of gingiva while gingivectomy is: 
Select and explain. 
A. Orban's knife, B. Kirkland's knife, C. BP blade with No. 11 blade, D. BP blade with No. 12 blade
B: Kirkland's knife
Answer: B: Kirkland's knife 
Explanation: None