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
Best treatment of 3 weeks old, fracture shaft femur with nonunion is 
Select and explain. 
A. Bone graft with internal fixation, B. External fixation, C. Internal fixation only, D. Prosthesis
A: Bone graft with internal fixation
Answer: A: Bone graft with internal fixation 
Explanation: A i.e. Bone grafting with internal fixation