This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intracranial Space Occupying Lesion, Subject name: Medicine
Stenosis of aqueduct of sylvius results in? 
Select and explain. 
A. Enlargement of lateral ventricles, B. Enlargement of fouh ventricles, C. Enlargement of lateral and third ventricles, D. Enlargement of lateral and fouh ventricles
C: Enlargement of lateral and third ventricles
Answer: C: Enlargement of lateral and third ventricles 
Explanation: Aqueduct of sylvius connects 3rd ventricle to the 4th one. Obstruction to Aqueduct of sylvius Enlargement of 3rd ventricle Dilatation of the ventricle proximal to the obstruction(3rd ventricle)