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
After Le-Fort 1 osteotomy the blood supply of maxilla is maintained by 
Select and explain. 
A. Posterior superior alveolar artery, B. Anterior superior alveolar artery, C. Greater palatine artery, D. Ascending palatine branch of facial artery
D: Ascending palatine branch of facial artery
Answer: D: Ascending palatine branch of facial artery 
Explanation: None