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': 'Treatment of Non-union of shaft femur \nSelect and explain. \nA. Open reduction with external fixation, B. Excision of the bone, C. Bone grafting with internal fixation with K-Nail, D. All of the following', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Bone grafting with internal fixation with K-Nail', 'role': 'assistant'}]