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': 'Oronasal intubation is not indicated in? \nSelect and explain. \nA. Lefort 1 #, B. Lefort 2 and 3 #, C. Parietal bone #, D. Mandibular #', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Nasal intubation is contraindicated in severe fractures of midface, nasal fracture and basilar skull fracture', 'role': 'assistant'}]