Assertion : Ebonite is highly vulcanised rubber.
Reason : Perlon is used in the manufacture of fibres.

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, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Ebonite is highly vulcanized rubber."
- Ebonite is indeed a type of rubber that has undergone a process called vulcanization, which involves adding sulfur to rubber to improve its hardness and elasticity. This process makes ebonite a very hard and durable material, often used in electrical insulators and other applications.

2. **Understanding the Reason**:
- The reason states that "Perlon is used in the manufacture of fibres."
- Perlon is a type of synthetic fiber, specifically a polyamide, which is indeed used in the manufacture of various textiles and fibers. This statement is also true.

3. **Evaluating the Relationship**:
- Both the assertion and the reason are true statements. However, the reason does not explain the assertion. The assertion about ebonite being highly vulcanized rubber does not depend on or relate to the fact that perlon is used in fiber manufacture.

4. **Conclusion**:
- Since both statements are true but the reason does not provide a correct explanation for the assertion, we conclude that the correct answer is that both the assertion and reason are true, but the reason is not the correct explanation for the assertion.

### Final Answer:
- The correct option is: Both assertion and reason are true, but the reason is not the correct explanation for the assertion.

---