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
Shortest root of maxillary 1st molar 
Select and explain. 
A. Distobuccal, B. Mesiobuccal, C. Palatal, D. All are equal
A: Distobuccal
Answer: A: Distobuccal 
Explanation: Distobuccal < Mesiobuccal <Palatal