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': 'Deformity of posterior dislocation of hip \nSelect and explain. \nA. Flexion, adduction, Internal rotation, B. Flexion, abduction, external rotation, C. Extension abduction, Internal rotation, D. Extension adduction, external rotation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Flexion, adduction, intenal rotation', 'role': 'assistant'}]