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: Pathology
[{'content': 'Which of the following would distinguish hydrocephalus due to aqueductal stenosis when compared to that due to Dandy Walker malformation- \nSelect and explain. \nA. Third ventricle size, B. Posterior fossa volume, C. Lateral ventricular size, D. Head circumference', 'role': 'user'}, {'content': 'Answer: B \nExplanation: To under stand this question you are required to know the basics of CSF production and drainage.', 'role': 'assistant'}]