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
Major diameter represents 
Select and explain. 
A. Apical Foramen, B. Apical constriction, C. CDJ, D. All of the above
A: Apical Foramen
Answer: A: Apical Foramen 
Explanation: None