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: Surgery
To obtain best long term result, which of the
following procedures for augmentation genioplasty is recommended: 
Select and explain. 
A. On lay bone graft, B. Injection of silastic gel, C. Insertion of silastic rubber implant, D. Pedicled horizontal sliding osteotomy
D: Pedicled horizontal sliding osteotomy
Answer: D: Pedicled horizontal sliding osteotomy 
Explanation: None