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 canine protected occlusion, the reason of choosing canine is/are 
Select and explain. 
A. Long roots, B. Good crown to root ratio, C. Surrounded by dense compact bone which tolerates forces better, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: The canine is chosen because of its 

Long roots
Good crown to root ratio
Surrounded by dense compact bone which tolerates forces better. 
Location is far from the TMJ thus receiving less stress.