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
Augmented genioplasty is done by: 
Select and explain. 
A. Sliding horizontal osteotomy, B. Bone grafts, C. Silicone implants, D. None of the above
A: Sliding horizontal osteotomy
Answer: A: Sliding horizontal osteotomy 
Explanation: None