Which part of the brain controls intelligence?

Given below are two statements regarding the nervous tissue of the central nervous system.
Statement $I$: The nervous tissue does not contain lymphatic vessels.
Statement $II$: $CSF$ is a lymph-like extracellular fluid secreted by the pia mater,choroid plexuses,and ependymal cells lining the ventricles of the brain and the central canal of the spinal cord.
In the light of the above statements,select the correct option given below.

The central nervous system develops as a result of

Epiphysis and hypophysis are associated with which part of the brain?

Where is the third ventricle of the brain located?

The association areas are present in the