This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and PNS, Subject name: ENT
[{'content': 'In Chevallet fracture of nasal septum the mechanism of trauma is: \nSelect and explain. \nA. Blow from above, B. Blow from below, C. Blow directly from front, D. Any of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (b) Blow from below(Ref. Scott Brown, 8th ed., Vol 3; 1127)Blow directly from front will cause Jarjavay fracture.Blow from side may depress only one nasal bone. Side force can cause severe septal displacement, which can twist or buckle the nose.', 'role': 'assistant'}]