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 mesencephalon \nSelect and explain. \nA. Lateral ventricle, B. Fouh ventricle, C. Cerebral acqueduct, D. Third ventricle', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The cavity of mesencephalon forms the cerebral aqueduct.The cavity of Rhombencephalon forms the fouh ventricle.The cavity of prosencephalon forms lateral and third ventricle.(Ref: Vishram Singh textbook of clinical neuroanatomy second edition pg 4)', 'role': 'assistant'}]