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
All of the following are pneumatic bones Except 
Select and explain. 
A. Maxilla, B. Parietal, C. Ethmoid, D. Mastoid
B: Parietal
Answer: B: Parietal 
Explanation: B. i.e. ParietalMaxilla, Mastoid, Ethmoid, Sphenoid & FrontalQ bones are pneumatic bones