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': 'Best treatment of 3 weeks old, fracture shaft femur with nonunion is \nSelect and explain. \nA. Bone graft with internal fixation, B. External fixation, C. Internal fixation only, D. Prosthesis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Bone grafting with internal fixation', 'role': 'assistant'}]