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
Cross section of K-flex file is: (OR) K-flex file is traditionally made form 
Select and explain. 
A. Rhomboidal, B. Circular, C. Spiral, D. Double helix
A: Rhomboidal
Answer: A: Rhomboidal 
Explanation: None