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: Surgery
[{'content': 'Most common facial bone involved in fracture is: \nSelect and explain. \nA. Maxilla, B. Mandible, C. Sphenoid, D. Zygomatic', 'role': 'user'}, {'content': "Answer: B \nExplanation: Facial bone fractures most commonly involve the mandible. Fractures most often involve the angle, body, or condyle, and in most cases, two or more sites are almost always involved. Ref: Schwaz's principle of surgery 9th edition, Chapter 18.", 'role': 'assistant'}]