This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Brainstem, cerebellum and ventricles, Subject name: Anatomy
In which pa of the brain is the cerebral aqueduct is found? 
Select and explain. 
A. Diencephalon, B. Mesencephalon, C. Metencephalon, D. Myelencephalon
B: Mesencephalon
Answer: B: Mesencephalon 
Explanation: Cerebral aqueduct of sylvius is found in the Midbrain (mesencephalon); it connects the third ventricle to the fouh ventricle. Midbrain is derived from mesencephalon.