Assertion : In cockroach respiratory gases directly comes in contact with the various organs of the body.
: Reason : Cockroaches do not have respiratory pigment

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

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that in cockroaches, respiratory gases come into direct contact with the various organs of the body. This is true because cockroaches have a unique respiratory system that relies on a network of tracheae (air tubes) that deliver oxygen directly to tissues.

2. **Understanding the Reason**: The reason provided is that cockroaches do not have respiratory pigments. This is also true. Cockroaches have hemolymph (their blood), which does not contain respiratory pigments like hemoglobin that are found in many other organisms. Instead, they rely on their tracheal system for gas exchange.

3. **Connecting Assertion and Reason**: The assertion is supported by the reason. Since cockroaches lack respiratory pigments, they cannot transport oxygen through their blood. Instead, oxygen diffuses directly from the tracheae into the tissues, making the assertion valid.

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

### Final Answer:
Both assertion and reason are true, and reason is the correct explanation of the assertion.

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