Answer: The correct for the blank is-
Brain and Spinal cord.
Brain and spinal cord together constitute the CNS (central nervous system) of the body, which is primarily responsible for intergration of the sensory information and producing appropriate response accordingly.
Spinal cord lies inferior to the brain and it links majority of the PNS (peripheral nervous system) to the brain. It also transmits sensory information (from various body parts) to the brain.
On the other hand, Brain intergrates the information, processes it, and produces appropriate response.
