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
Registration point: 
Select and explain. 
A. Point 'A', B. A point half way on the perpendicular from sella to Boltons plane, C. Nasion, D. Point 'B'
B: A point half way on the perpendicular from sella to Boltons plane
Answer: B: A point half way on the perpendicular from sella to Boltons plane 
Explanation: None