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
In crown down technique: 
Select and explain. 
A. K file is used without reaming motion pressure., B. K file is used with a reaming motion and no apical pressure., C. Both can be done., D. None of the above.
B: K file is used with a reaming motion and no apical pressure.
Answer: B: K file is used with a reaming motion and no apical pressure. 
Explanation: Crown-Down Pressureless Technique: This technique was suggested by Marshall and Pappin. Early coronal flaring with Gates-Glidden drills is followed by an incremental removal of dentin from coronal to apical direction, and hence called “Crown-down technique. Straight K-files are then used in a large to small sequence with a reaming motion and no apical pressure – hence called “Pressureless” technique.