Assertion: Macrophages occur only in the connective tissue.
Reason: Role of neutrophils is different from that of macrophages.

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 and the Reason is not the correct explanation of the Assertion.
C. If Assertion is true but the Reason is false.
D. If both Assertion and Reason are false.

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that "Macrophages occur only in the connective tissue." This is a claim about the location of macrophages in the body.

2. **Analyzing the Assertion**: Macrophages are derived from monocytes, which circulate in the blood and migrate into various tissues. Once they enter tissues, they can differentiate into specific types of macrophages depending on the tissue (e.g., Kupffer cells in the liver, alveolar macrophages in the lungs). Therefore, macrophages are not limited to connective tissue; they can be found in various tissues throughout the body.

3. **Conclusion on the Assertion**: The assertion is **false** because macrophages are present in multiple tissues, not just in connective tissue.

4. **Understanding the Reason**: The reason states that "The role of neutrophils is different from that of macrophages." This is a claim about the functional differences between these two types of immune cells.

5. **Analyzing the Reason**: Both neutrophils and macrophages are phagocytic cells, meaning they both play a role in engulfing and destroying pathogens. While they may have different mechanisms and timing in their responses, their primary function of phagocytosis is similar.

6. **Conclusion on the Reason**: The reason is also **false** because neutrophils and macrophages share a similar role in the immune response.

7. **Final Evaluation**: Since both the assertion and the reason are false, the correct answer to the question is that both statements are incorrect.