Assertion : Excretion in cockroach occurs by Malpighian tubules
Reason : Each Malpighian tubule is lined by non-ciliated columnar cells.

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 but 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 regarding the assertion and reason about the excretion in cockroaches, we will analyze both statements step by step.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Excretion in cockroach occurs by Malpighian tubules."
- This is true. Cockroaches have a specialized excretory system that includes Malpighian tubules, which are responsible for the excretion of nitrogenous wastes.

2. **Understanding the Reason**:
- The reason states that "Each Malpighian tubule is lined by non-ciliated columnar cells."
- This statement is false. Malpighian tubules are lined by glandular cells and ciliated cells, not non-ciliated columnar cells.

3. **Evaluating the Relationship**:
- Since the assertion is true and the reason is false, we conclude that the reason does not correctly explain the assertion.

4. **Final Conclusion**:
- Therefore, the answer to the question is: "Assertion is true, but reason is false."