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': "Action of intramedullary 'K' nail is \nSelect and explain. \nA. Two-point fixation, B. Three-point fixation, C. Compression, D. Weight concentration", 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Three - point fixation', 'role': 'assistant'}]