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 foramen is offcenter the root apex 
Select and explain. 
A. 0.5-3 mm, B. 0.5- 1 mm, C. 1.5-4 mm, D. 1.5-3 mm
A: 0.5-3 mm
Answer: A: 0.5-3 mm 
Explanation: None