Concept:
The nervous system is divided into two major parts:
• Central Nervous System (CNS)
• Peripheral Nervous System (PNS)
The Central Nervous System consists of:
\[
\text{Brain and Spinal cord}
\]
The brain controls body activities and thought processes, while the spinal cord transmits signals between the brain and the rest of the body.
Step 1: Recall the components of the Central Nervous System.
The CNS is composed of two main organs:
\[
\text{Brain and Spinal cord}
\]
Step 2: Choose the correct option.
Among the given options, the correct answer is:
\[
\boxed{(D)\ \text{Spinal cord and Brain}}
\]