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 elderly patients distance between major and minor 
apical foramina is 
Select and explain. 
A. 1.5-2 mm, B. 0.75-1 mm, C. 0.2-0.5mm, D. 0-0.2 mm
B: 0.75-1 mm
Answer: B: 0.75-1 mm 
Explanation: None