This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Brain , Subject name: Anatomy
Cavity of midbrain 
Select and explain. 
A. Lateral ventricle, B. Third ventricle, C. Cerebral aqueduct, D. None
C: Cerebral aqueduct
Answer: C: Cerebral aqueduct 
Explanation: Cavity of midbrain- cerebral aqueductCavity of hindbrain- 4th ventricleCavity of forebrain- lateral & 3rd ventricle(Ref: vishram Singh textbook of clinical neuroanatomy second edition pg 4)