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': 'The deformity of tibia in triple deformity of the knee is? \nSelect and explain. \nA. Extension, Posterior subluxation & external rotation, B. Flexion, posterior subluxation & external rotation, C. Flexion, posterior subluxation & internal rotation, D. Extension, Anterior subluxation & internal rotation', 'role': 'user'}, {'content': "Answer: B \nExplanation: Flexion, posterior subluxation & external rotation REF: Apley's 8th ed p. 42 Triple deformity of knee consists of flexion, posterior subluxation of tibia and external rotation of tibia Treatment: ATT, Ahrodesis Causes: TB, Rheumatoid ahritis", 'role': 'assistant'}]