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
[{'content': 'All of the following are pneumatic bones except? \nSelect and explain. \nA. Frontal, B. Ethmoid, C. Mandible, D. Maxilla', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Pneumatic bones are maxilla, frontal, sphenoid, ethmoid bones and mastoid process.', 'role': 'assistant'}]