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. Frontal, B. Ethmoid, C. Mandible, D. Maxilla
C: Mandible
Answer: C: Mandible 
Explanation: Pneumatic bones are maxilla, frontal, sphenoid, ethmoid bones and mastoid process.