Answer (a) Roof of Diencephalon
It is present on the roof of Diencephalon. Choroid plexus is a specialised structure and is responsible for the production of cerebrospinal fluid (CSF) and has a role in protecting the brain and maintaining the stable environment. The choroid plexus has a network of blood vessels that can transport ions and other substances.
The human nervous system is responsible for controlling and coordinating all the activities of the human body.
The Central Nervous System (CNS) comprises the brain and spinal cord.
The Peripheral Nervous System (PNS) comprises sensory/motor neurons and ganglion.