This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Osteology of Head and Neck, Subject name: Anatomy
All of the following are pneumatic bone EXCEPT: 
Select and explain. 
A. Maxilla, B. Frontal, C. Mandible, D. Ethmoid
C: Mandible
Answer: C: Mandible 
Explanation: Ans. (c) MandibleRef: Gray's 38th ed./431* Pneumatic Bone: Some cranial bones have air filled cavities for making skull light weight, resonance of voice & air conditioning.* Maxilla, Mastoid, Ethmoid, Sphenoid & Frontal bones are pneumatic bones.Types of boneSesamoid bonesPneumatic bone (Mn: It has Maximum Spherical Front Mass)Membranous (Dermal) bone* Patella* Pisiform* Fabella* Ethmoid* Maxilla* Sphenoid* Frontal* Mastoid (temporal)* Skull vault bones* Facial bones