Assertion : If two men, expire the same volume of air after normal inspiration, they have the same expiratory capacity.
Reason : Expiratory capacity includes tidal volume and inspiratory reserve volume.

Options

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

Explanation

To solve the question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that if two men expire the same volume of air after normal inspiration, they have the same expiratory capacity.
- Expiratory capacity is defined as the maximum amount of air that can be expired after a normal tidal breath. It is the sum of tidal volume (the amount of air inhaled or exhaled during normal breathing) and expiratory reserve volume (the additional air that can be forcibly exhaled after the expiration of a normal tidal volume).

2. **Understanding the Reason**:
- The reason states that expiratory capacity includes tidal volume and inspiratory reserve volume.
- However, this statement is incorrect. Expiratory capacity actually includes tidal volume and expiratory reserve volume, not inspiratory reserve volume.

3. **Evaluating the Assertion**:
- Since both men are expiring the same volume of air after normal inspiration, it logically follows that they have the same expiratory capacity. Thus, the assertion is true.

4. **Evaluating the Reason**:
- The reason is incorrect because it misstates the components of expiratory capacity. It should include tidal volume and expiratory reserve volume, not inspiratory reserve volume.

5. **Conclusion**:
- Therefore, we conclude that the assertion is true, but the reason is false.

### Final Answer:
- **Assertion**: True
- **Reason**: False