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': "Subtrochanteric fractures of femur can be treated by all of the following methods, EXCEPT: \nSelect and explain. \nA. Skeletal traction on Thomas' splint, B. Smith Petersen Nail, C. Condylar blade plate, D. Ender'snail", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Smith Petersen Nail', 'role': 'assistant'}]