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
Lefort-II fracture involves all of the following bones, except: 
Select and explain. 
A. Maxilla, B. Nasal, C. Ethmoidal bone, D. Lacrimal bone
C: Ethmoidal bone
Answer: C: Ethmoidal bone 
Explanation: Guerin fracture is other name for Le Fort I or low level fracture.
Le Fort II involves maxilla, nasal, lacrimal bones.
Le Fort III involves maxilla, lacrimal, nasal and ethmoidal bones.