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
Bone graft procedures are most successful in treating: 
Select and explain. 
A. In furcation involvements, B. Deep, two-wall craters, C. Narrow three-wall defects, D. Osseous defects with one remaining wall
C: Narrow three-wall defects
Answer: C: Narrow three-wall defects 
Explanation: None