Assertion : The cerebral cortex is referred to as the grey matter due to its greyish appearance.
Reason : The neuron cell bodies are concentrated in the cerebral cortex.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Explanation

To analyze the given assertion and reason, let's break it down step by step:

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that the cerebral cortex is referred to as the grey matter due to its greyish appearance.
- This is true because the cerebral cortex does indeed have a greyish color.

**Hint**: Think about the color of the brain regions and what contributes to that color.

2. **Understanding the Reason**:
- The reason provided states that the neuron cell bodies are concentrated in the cerebral cortex.
- This is also true. The cerebral cortex contains a high concentration of neuron cell bodies, which contribute to its greyish appearance.

**Hint**: Consider what structures in the brain contain neuron cell bodies and how that affects color.

3. **Connecting Assertion and Reason**:
- The assertion and the reason are connected. The reason explains why the cerebral cortex has a greyish appearance; it is due to the concentration of neuron cell bodies in that area.
- Therefore, both the assertion and the reason are correct, and the reason is a valid explanation for the assertion.

**Hint**: Reflect on how the structure of the cerebral cortex relates to its function and appearance.

4. **Conclusion**:
- Since both the assertion and reason are true, and the reason correctly explains the assertion, we can conclude that the statement is accurate.

**Hint**: Summarize the relationship between the structure (neuron cell bodies) and the appearance (grey matter) of the cerebral cortex.

### Final Answer:
Both the assertion and the reason are correct, and the reason is the correct explanation for the assertion.