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 attitude of limb in posterior dislocation of hip joint: March 2011 \nSelect and explain. \nA. Flexion, adduction and external rotation, B. Flexion, adduction and internal rotation, C. Flexion, abduction and external rotation, D. Flexion, abduction and internal rotation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: Flexion, adduction and internal rotation An isolated posterior dislocation of the hip is easy to diagnose The patient presents with a history of severe trauma followed by pain, swelling and deformity (flexion, adduction and internal rotation)', 'role': 'assistant'}]