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: Orthopaedics
[{'content': "Subtrochanteric fractures of the 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's nail", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Smith Peterson Nail is a cannulated tri-flanged nail that was used for internal fixation of fracture neck of femur Results obtained by S-P nail were dissatisfactory and it is no more recommended for use these days.\nOther three options are used for the treatment of the subtrochanteric fracture.', 'role': 'assistant'}]