Assertion : Adrenal gland have dual origin.
Reason : The aderenal cortex develops from endoderm while adrenal medulla develops from mesoderm.

Options

A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
B. If both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion.
C. If Assertion is true, but Reason is false.
D. If both Assertion and Reason are false.

Answer

### Step-by-Step Solution

1. **Understanding the Assertion**: The assertion states that the adrenal gland has a dual origin. This means that the adrenal gland is formed from two different embryonic layers.

2. **Identifying the Components of the Adrenal Gland**: The adrenal gland consists of two main parts: the adrenal cortex and the adrenal medulla.

3. **Origin of the Adrenal Cortex**: The adrenal cortex is the outer part of the adrenal gland. It develops from the mesoderm layer of the embryo.

4. **Origin of the Adrenal Medulla**: The adrenal medulla is the inner part of the adrenal gland. It develops from the ectoderm layer of the embryo.

5. **Evaluating the Reason**: The reason provided states that the adrenal cortex develops from the endoderm and the adrenal medulla develops from the mesoderm. This is incorrect because:
- The adrenal cortex develops from the mesoderm, not the endoderm.
- The adrenal medulla develops from the ectoderm, not the mesoderm.

6. **Conclusion**: Since the assertion is true (the adrenal gland has dual origin), but the reason is false (the origins of the cortex and medulla are incorrectly stated), the correct answer is that the assertion is true, but the reason is false.

### Final Answer
- **Assertion**: True
- **Reason**: False