Answer: a. brain and spinal cord.
Explanation:
The nervous system divides as, -(1) the peripheral nervous system and (2) the central nervous system . The central nervous system is the processing centre of the body. The central nervous system is consist of two parts ; (1) the brain and (2) spinal cord. The central nervous system is referred to as “central” because it received information from the body and then integrates the received information.