# Which of the following bone is not pneumatic?
A. Mandible
B. Frontal
C. Mastoid
D. Ethmoid
The correct answer is A. Mandible.
Any bone, which contains air spaces within its body is called as pneumatic bone. Maxillary, frontal, ethmoid, mastoid, sphenoid bone, etc. all are ethmoid bones.
Mandible is not a pneumatic bone.
Mandible
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