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': 'Fracture of femur at the level of isthmus is best treated by \nSelect and explain. \nA. Intramedullary nail fixation, B. Plate and screws, C. Closed method, D. External fixation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Intramedullary nail fixation', 'role': 'assistant'}]