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': 'Vascular sign of Narath is noticed in \nSelect and explain. \nA. Fracture neck of femur, B. Pehes disease, C. Posterior dislocation of hip, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Posterior dislocation of hip Vascular sign of narath is positive in posterior dislocation of hip joint. Due to posterior dislocation, the hip joint falls on the femoral aery, and this causes feeble or absent femoral pulse.', 'role': 'assistant'}]