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
Genioplasty procedure is used 
Select and explain. 
A. To change the attachment of genioglossus muscle in pre-prosthetic procedure, B. To change the position of genial tubercles, C. To modify the position of the chin, D. To modify the attachment of anterior belly of digastric
C: To modify the position of the chin
Answer: C: To modify the position of the chin 
Explanation: None