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': 'All of the following structures pass through the greater sciatic foramen, EXCEPT? \nSelect and explain. \nA. Piriformis muscle, B. Pudendal nerve, C. Inferior gluteal vessel, D. Internal pudendal vessel', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pudendal nerve courses through the lesser sciatic foramen. Structures passing through the lesser sciatic foramen are:Pudendal nerveInternal pudendal vesselsObturator internus tendonStructures passing through the greater sciatic foramen are:Sciatic nervePiriformis muscleInternal pudendal and inferior gluteal vesselsOther branches of the sacral nerve plexus', 'role': 'assistant'}]