Correct Answer:
A. Brain and Spinal Cord
Explanation: The Central Nervous System (CNS) consists of only two main parts: the brain and the spinal cord. The CNS is responsible for receiving, processing, and coordinating information throughout the body.
Why the other options are incorrect:
- Cerebrum, Thalamus and Hypothalamus: These are important parts of the brain but do not represent the complete Central Nervous System.
- Brain, Spinal Cord and Peripheral Nerves: Peripheral nerves belong to the Peripheral Nervous System (PNS), not the CNS.
- All of these: Incorrect because only the brain and spinal cord make up the Central Nervous System.