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
Round, ribbon-shaped, ovoid, bowling pin and kidney-bean are all types of root canals seen on 
Select and explain. 
A. Oblique section, B. Longitudinal section, C. Sagittal section, D. Cross section
D: Cross section
Answer: D: Cross section 
Explanation: None