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. Maxilla, B. Parietal, C. Ethmoid, D. Mastoid', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B. i.e. ParietalMaxilla, Mastoid, Ethmoid, Sphenoid & FrontalQ bones are pneumatic bones', 'role': 'assistant'}]