Assertion `:-` Feedback mechanism for regulation of kidney involve hypothalamus & JGA.
Reason `:-` ANF mechanism check renin-angiotensin mechanism.
(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) Assertion is True but the Reason is False.
(d) If both Assertion & Reason are false.

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 analyze the assertion and reason provided in the question, we will break down the key components of each statement and evaluate their truthfulness and relationship.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that the feedback mechanism for the regulation of the kidney involves the hypothalamus and the juxtaglomerular apparatus (JGA).
- The hypothalamus plays a role in regulating body fluids through osmoreceptors and releasing hormones like the atrial natriuretic factor (ANF). The JGA is involved in the regulation of blood pressure and fluid balance by releasing renin.

2. **Understanding the Reason**:
- The reason states that the ANF mechanism checks the renin-angiotensin mechanism.
- ANF, released by the heart, indeed acts to counteract the effects of the renin-angiotensin system by promoting sodium excretion and lowering blood pressure.

3. **Evaluating the Truth of the Assertion**:
- The assertion is true. Both the hypothalamus and JGA play significant roles in kidney regulation through hormonal feedback mechanisms.

4. **Evaluating the Truth of the Reason**:
- The reason is also true. The ANF mechanism does inhibit the renin-angiotensin system, which is crucial for fluid balance and blood pressure regulation.

5. **Determining the Relationship**:
- While both statements are true, the reason does not directly explain how the feedback mechanism involving the hypothalamus and JGA regulates the kidney. The assertion discusses the involvement of both structures, while the reason focuses solely on the action of ANF against the renin-angiotensin system.

6. **Conclusion**:
- Since both the assertion and reason are true, but the reason does not correctly explain the assertion, the correct answer is (b): If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.