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
Obstruction to the flow of CSF at the aqueduct of sylvius will most likely lead to enlargement of: 
Select and explain. 
A. All of the ventricles, B. Only lateral ventricle, C. Only fouh ventricle, D. Both lateral and third ventricles
D: Both lateral and third ventricles
Answer: D: Both lateral and third ventricles 
Explanation: . Both lateral and third ventricles