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
Intra oral vertical ramus osteotomy is done for 
Select and explain. 
A. Anterior open bite, B. Mandibular advancement, C. Mandibular set back, D. Maxillary deformity
C: Mandibular set back
Answer: C: Mandibular set back 
Explanation: None