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
Which number blade is useful for Crevicular incision : 
Select and explain. 
A. 10, B. 11, C. 12, D. 15
C: 12
Answer: C: 12 
Explanation: Crevicular incision is also known as Second incision for which 12 number blade is used.