This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Osteology of Lower Extremity, Subject name: Anatomy
[{'content': 'Structures passing through lesser sciatic foramen are all EXCEPT: \nSelect and explain. \nA. Pudendal nerve, B. Internal pudendal vessels, C. Nerve to obturator extemus, D. Nerve to obturator internus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: ANSWER: (C) Nerve to obturator externusREF: BDC 4th ed VOL-II p. 79, grays 39th e p. 688Structures passing through Greater sciatic foramen:Above pyriformis - superior gluteal nerves and vesselsBelow pyriformis -Posterior cutaneous nerves of thighInferior gluteal nerves and vesselsNerves to quadratus femorisSciatic nervePudendal nerve Internal pudendal vesselsNerve to obturator internusStructures passing through lesser sciatic foramen:Pudendal nerveInternal pudendal vesselsNerve to obturator internusTendon of obturator internus', 'role': 'assistant'}]