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': 'Displaced transverse patella, Rx is: \nSelect and explain. \nA. Patellectomy, B. Tension band wiring, C. POP cast, D. Non operative', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Tension band wiring Fracture Patella The mechanical function of patella is to hold the entire extensor strap away from the centre of rotation of knee, there by lengthening the anterior lever arm and increasing the efficiency of the quadriceps.', 'role': 'assistant'}]