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
Which of the instrument is used to locate the canal
orifice 
Select and explain. 
A. Smooth broaches, B. Endodontic explorer, C. Canal opener, D. Gates Glidden drill
B: Endodontic explorer
Answer: B: Endodontic explorer 
Explanation: None