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': 'Which is a pneumatic bones:March 2012 \nSelect and explain. \nA. Clavicle, B. Maxilla, C. Humerus, D. Femur', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans: B i.e. MaxillaCeain irregular bone contains large air spaces lined by epithelium. Examples: maxilla, sphenoid, ethmoid etc.', 'role': 'assistant'}]