Assertion :- Diaphragm, cervical cap and vaults are barrier made up of rubber.
Reason :- They do not provide protection against STDs.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are False.

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 that "Diaphragm, cervical cap, and vaults are barriers made up of rubber."
- These devices are indeed barriers used for contraception. They are inserted into the female reproductive tract to cover the cervix and prevent sperm from entering the uterus.

2. **Evaluating the Assertion**:
- The diaphragm, cervical cap, and vaults are primarily made of rubber or similar materials.
- Therefore, the assertion is **true**.

3. **Understanding the Reason**:
- The reason states that "They do not provide protection against STDs."
- It is well-known that while these barrier methods can prevent pregnancy, they do not effectively protect against sexually transmitted diseases (STDs).

4. **Evaluating the Reason**:
- The reason is also **true** because these devices do not offer protection against STDs.

5. **Conclusion**:
- Both the assertion and reason are true.
- However, the reason does not correctly explain the assertion; it simply states a fact about the effectiveness of these barriers regarding STDs.

### Final Answer:
- The correct option is: **Both assertion and reason are true, but the reason is not a correct expression of the assertion.**