1200 ml volume of air that always remains in the lungs even after the forcible expiration is called :

Options

A. Tidal Volume
B. Residual Volume
C. Vital capacity
D. Inspiratory Volume

Answer

To solve the question regarding the volume of air that remains in the lungs even after forcible expiration, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Lung Volumes**:
- The lungs have different volumes of air that can be measured, including tidal volume, residual volume, vital capacity, and inspiratory volume. Each of these terms has a specific definition related to lung function.

2. **Identifying Tidal Volume**:
- Tidal volume is the amount of air that is inhaled or exhaled during a normal breath. It does not account for the air that remains in the lungs after forcible expiration. Therefore, this option is not correct.

3. **Identifying Residual Volume**:
- Residual volume is the amount of air that remains in the lungs after a person has exhaled as much air as possible (forcible expiration). This volume helps keep the lungs inflated and is typically around 1200 ml. This matches the description given in the question.

4. **Identifying Vital Capacity**:
- Vital capacity is the maximum amount of air that can be expelled from the lungs after taking the deepest breath possible. This is not the volume that remains after expiration, so this option is incorrect.

5. **Identifying Inspiratory Volume**:
- Inspiratory volume refers to the amount of air that can be forcefully inhaled after a normal tidal volume. This does not pertain to the air remaining in the lungs after expiration, making this option incorrect as well.

6. **Conclusion**:
- Based on the definitions and the volume mentioned in the question (1200 ml), the correct answer is **Residual Volume**.

### Final Answer:
The volume of air that always remains in the lungs even after forcible expiration is called **Residual Volume**.

---