This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Orthopaedics
[{'content': '"Trendelenburg sign" isn\'t positive in damage of the following nerve \nSelect and explain. \nA. Inferior gluteal nerve, B. Pudendal nerve, C. Superior gluteal nerve, D. Posterior tibial nerve', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Causes of positive trendelenberg test: *There are three fundamental causes: 1) Paralysis of the abductor muscles *eg. Polio *Paralysis of superior gluteral nerve 2) Marked approximation of the inseion of the abductor muscle to their origin by upward displacement of the greater trochanter; so that muscles are slack. *eg. Severe coxa vara *Dislocation of hip 3) Absence of stable fulcrum & lever arm about which the abductor muscles can act *Neck femur fracture *Dislocation of hip :Ref: Maheshwari 4th/e p.348', 'role': 'assistant'}]