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: Orthopaedics
[{'content': 'Undisplaced fracture patella treated with \nSelect and explain. \nA. Tube Cast, B. Nailing, C. Tension band wiring, D. Observation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]