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': 'Commonest presentation of congenital dislocation of the knee is - \nSelect and explain. \nA. Varus, B. Valgus, C. Flexion, D. Hyperextens ion', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The patient presents with hyperextension deformity of the knee.', 'role': 'assistant'}]