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
Which of the following would distinguish hydrocephalusdue to aqueductal stenosis when compared to thatdue to Dandy walker malformation: 
Select and explain. 
A. Third ventricle size, B. Posterior fossa volume., C. Lateral ventricular size, D. Head circumference.
B: Posterior fossa volume.
Answer: B: Posterior fossa volume. 
Explanation: . Posterior fossa volume.