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
2nd Mesiobuccal canal can be seen from naked eyes in what percentage of cases 
Select and explain. 
A. 62-70%, B. 90-95%, C. 30%, D. 40-55%
A: 62-70%
Answer: A: 62-70% 
Explanation: None