This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen and pelvis, Subject name: Anatomy
[{'content': 'A 5-year-old boy presents with recurrent headaches. As pa of his assessment, he undergoes an MRI scan of his brain. This demonstrates enlargement of the lateral and third ventricles. Where is the most likely site of obstruction? \nSelect and explain. \nA. Foramen of Luschka, B. Foramen of Magendie, C. Foramen of Munro, D. Aqueduct of Sylvius', 'role': 'user'}, {'content': 'Answer: D \nExplanation: NameFromTointerventricular foramina (Monro)lateral ventriclesthird ventriclecerebral aqueduct (Sylvius)third ventriclefouh ventriclemedian apeure (Magendie)fouh ventriclesubarachnoid space the cisterna magnaright and left lateral apeure (Luschka)fouh ventriclesubarachnoid space the cistern of great cerebral vein', 'role': 'assistant'}]