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 part of the instrument should remain parallel
(whenever possible) to the long axis of the tooth? 
Select and explain. 
A. Blade, B. Cutting edge, C. Handle, D. Shank
D: Shank
Answer: D: Shank 
Explanation: None