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 hydrocephalusdue to aqueductal stenosis when compared to thatdue 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: . Posterior fossa volume.', 'role': 'assistant'}]