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
Process of canal preparation shown in color plate is called as: 
Select and explain. 
A. Crown down technique, B. Step back technique, C. Balanced force technique, D. Standardized technique
B: Step back technique
Answer: B: Step back technique 
Explanation: None