Assertion : Perspiration from human body helps in cooling the body.
Reason : A thin layer of water on the skin enhances its emissivity.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion.
B. if both assertion and reason are true but reason is not the correct expalanation of the assertion
C. if assertion is true , but reason is false
D. both assertion and reason are false statements.

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: "Perspiration from the human body helps in cooling the body."
- This is true. Perspiration (sweating) is a physiological process where sweat evaporates from the skin surface, taking heat away from the body. This process is known as evaporative cooling.

2. **Understanding the Reason**:
- The reason states: "A thin layer of water on the skin enhances its emissivity."
- This statement is incorrect. Emissivity refers to the ability of a surface to emit thermal radiation. A thin layer of water on the skin actually decreases emissivity because water has a high heat capacity and reflects some thermal radiation rather than emitting it effectively.

3. **Conclusion**:
- Since the assertion is true and the reason is false, we can conclude that the correct relationship is that the assertion is true, but the reason is false.

4. **Final Answer**:
- The correct option is that the assertion is true and the reason is false.