Assertion `:-` The anatomical setup of lungs in thorax is such that any change in the volume of the thoracic cavity will be reflected in the lung cavity. (Pulmonary cavity )
Reason `:-` Lungs have no muscles so we cannot directly alter the pulmonary volume

Options

A. If both Assertion & Reason are True & the Reasonn is a correct explanation of the Assertion .
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are false.

Answer

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 the anatomical setup of the lungs in the thorax is such that any change in the volume of the thoracic cavity will be reflected in the lung cavity (pulmonary cavity).
- This is true because the lungs are located within the thoracic cavity, and any expansion or contraction of the thoracic cavity directly affects the lungs due to the pleural membranes that surround them.

2. **Understanding the Reason**:
- The reason states that the lungs have no muscles, so we cannot directly alter the pulmonary volume.
- This is also true. The lungs themselves do not have muscular tissue to contract or expand. Instead, they rely on the movement of the thoracic cavity, which is facilitated by the intercostal muscles and the diaphragm.

3. **Connecting the Assertion and Reason**:
- The assertion is supported by the reason. Since the lungs do not have muscles, they cannot change their volume independently. Instead, they rely on the changes in the thoracic cavity volume, which is influenced by the muscles of respiration (intercostal muscles and diaphragm).

4. **Conclusion**:
- Both the assertion and the reason are true, and the reason correctly explains the assertion. Therefore, the correct answer is that both statements are true, and the reason is a correct explanation of the assertion.

### Final Answer:
Both the assertion and reason are true, and the reason correctly explains the assertion.