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: Anatomy
[{'content': 'Structures passing through lesser sciatic foramen are all, except: \nSelect and explain. \nA. Pudendal nerve, B. Internal pudendal aery, C. Nerve to obturator externus, D. Tendon of obturator internus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Structures passing through lesser sciatic foramen are tendon of obturator internus muscle, nerve to obturator internus, pudendal nerve, internal pudendal aery and vein.Structures passing through greater sciatic foramen are:PiriformisSciatic nervePosterior cutaneous nerve of thighSuperior and inferior gluteal nerveNerve to obturator internus and quadratus femorisPudendal nerveSuperior and inferior gluteal nerves and aeriesInternal pudendal aery and vein', 'role': 'assistant'}]