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
On the basis of X height of b/w lower edge of mental foramen & inferior border of mandible original alveolar ridge height will be? 
Select and explain. 
A. 2X, B. 3X, C. 4X, D. 5X
B: 3X
Answer: B: 3X 
Explanation: None