Assertion : Emphysema is a chronic disorder in which alveolar walls are damaged.
Reason : Emphysema is closely related to cigarctte smoking.

Options

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

Explanation

**Step-by-Step Solution:**

1. **Understanding the Assertion:**
- The assertion states that "Emphysema is a chronic disorder in which alveolar walls are damaged."
- This statement is true. Emphysema is characterized by the destruction of the alveolar walls, leading to a decrease in the surface area available for gas exchange.

2. **Understanding the Reason:**
- The reason states that "Emphysema is closely related to cigarette smoking."
- This statement is also true. Cigarette smoking is the primary cause of emphysema, as it leads to chronic inflammation and damage to the lung tissue.

3. **Connecting Assertion and Reason:**
- The assertion describes the condition of emphysema, while the reason explains one of the major causes of this condition.
- Since smoking is a significant factor contributing to the damage of the alveolar walls, the reason provides a correct explanation for the assertion.

4. **Conclusion:**
- Both the assertion and the reason are true, and the reason correctly explains the assertion.
- Therefore, the correct answer is option A: "Both assertion and reason are true, and the reason is a correct explanation of the assertion."

---