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
[{'content': 'Cavity of midbrain \nSelect and explain. \nA. Lateral ventricle, B. Third ventricle, C. Cerebral aqueduct, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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)', 'role': 'assistant'}]