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 bones are pneumatic, except: 
Select and explain. 
A. Maxillary, B. Parietal, C. Frontal, D. Ethmoidal
B: Parietal
Answer: B: Parietal 
Explanation: Pneumatic bones are those bones which contain an air filled cavity within them. 
In humans, they are seen in relation to the the nasal cavity – they enclose the paranasal sinuses. 
Pneumatic bones are – maxilla, frontal bone, sphenoid and ethmoid.