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
Diencephalon represents 
Select and explain. 
A. Lateral ventricle, B. 3rd ventricle, C. 4th ventricle, D. Aquedct
B: 3rd ventricle
Answer: B: 3rd ventricle 
Explanation: The diencephalon is the pa of brain between the cerebrum and brainstem.The cavity within it is called third ventricleThe pas of diencephalon are:ThalamusMetathalamusEpithalamusSubthalamusHypothalamus(Ref: Vishram Singh textbook of clinical neuroanatomy Second Edition pg -123)