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
Apical constriction is ……………mm coronal to Apical foramen 
Select and explain. 
A. 0-0.5, B. 0.5-1.5, C. 1.5-2.5, D. 2-Jan
B: 0.5-1.5
Answer: B: 0.5-1.5 
Explanation: None