Assertion : If there is no air in trachea, it will collapse.
Reason : Trachea is having the cartilagenous ring.

Explanation

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

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states, "If there is no air in the trachea, it will collapse."
- The trachea is a tube that carries air to and from the lungs. It is designed to remain open to facilitate this function.

2. **Analyzing the Assertion**: If there is no air in the trachea, the pressure inside the trachea would drop. In theory, this could lead to collapse. However, the trachea is supported structurally by cartilaginous rings.

3. **Understanding the Reason**: The reason states, "Trachea is having the cartilaginous ring."
- The trachea does indeed have C-shaped cartilaginous rings that provide structural support and prevent it from collapsing.

4. **Analyzing the Reason**: The presence of these cartilaginous rings means that the trachea maintains its shape and remains open even if there is a drop in pressure due to lack of air.

5. **Conclusion**:
- The assertion is **false** because the trachea will not collapse even if there is no air due to the support from the cartilaginous rings.
- The reason is **true** because the trachea does have cartilaginous rings that provide structural integrity.

6. **Final Answer**: Since the assertion is false and the reason is true, the correct conclusion is that the assertion and reason cannot be true together.