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
Which of these orthognathic surgeries needs a horizontal cut in the ramus? 
Select and explain. 
A. VRO, B. SSRO, C. Inverted Losteotomy, D. Subapical osteotomy
B: SSRO
Answer: B: SSRO 
Explanation: SSRO- Sagittal Split Ramus Osteotomy, which if done bilaterally is called BSSO. It involves a horizontal cur in the ramus on the medial side up to lingual, a vertical cut in the body between first and second molar up to the interior border and a sagittal cut, connecting the previous two cuts. SSRO is the work horse of mandibular orthognathic surgeries and is used for advancements, setbacks and minor asymmetry corrections.