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
Goal of Visor osteotomy is 
Select and explain. 
A. Increase the height of mandibular ridge for denture support, B. Reduce the bony undercut on both sides if present bilaterally, C. Reduce the bony spicules present on ridge hindering the denture placement, D. All of the above
A: Increase the height of mandibular ridge for denture support
Answer: A: Increase the height of mandibular ridge for denture support 
Explanation: None