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
Subtrochanteric fractures of femur can be treated by all of the following methods, EXCEPT: 
Select and explain. 
A. Skeletal traction on Thomas' splint, B. Smith Petersen Nail, C. Condylar blade plate, D. Ender'snail
B: Smith Petersen Nail
Answer: B: Smith Petersen Nail 
Explanation: Smith Petersen Nail