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
All are true about osseous crater except 
Select and explain. 
A. 2/3rd of all mandibular defects, B. 2 times more common in anterior region as compared to posterior, C. 85% lingual and facial height is same, D. 1/3rd of all defects
B: 2 times more common in anterior region as compared to posterior
Answer: B: 2 times more common in anterior region as compared to posterior 
Explanation: None