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: Anatomy
Bone which is Pneumatic -a) Maxillaryb) Parietalc) Temporald) Frontal e) Ethmoidal 
Select and explain. 
A. ade, B. bde, C. abd, D. ad
A: ade
Answer: A: ade 
Explanation: None