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
Which of the following procedures is least successful in
resolving a periodontally related osseous defect 
Select and explain. 
A. Osseous coagulum graft, B. Resection surgery, C. Reattachment procedure, D. Alloplast graft
C: Reattachment procedure
Answer: C: Reattachment procedure 
Explanation: None