Assertion :- Aldosterone is known as salt retaining hormone.
Reason:- It reduces Na reabsorption from urine to increase its loss from the body.

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.

Answer

**Step-by-Step Text Solution:**

1. **Understanding the Assertion**: The assertion states that "Aldosterone is known as the salt-retaining hormone." This is correct. Aldosterone is a steroid hormone produced by the adrenal cortex, and its primary function is to promote the reabsorption of sodium ions in the kidneys.

2. **Understanding the Reason**: The reason provided is that "It reduces Na reabsorption from urine to increase its loss from the body." This statement is incorrect. Aldosterone actually increases sodium reabsorption in the renal tubules, which leads to less sodium being lost in the urine.

3. **Analyzing the Relationship**: Since the assertion is true (aldosterone does retain salt) and the reason is false (it does not reduce sodium reabsorption), we conclude that the assertion and reason are not in agreement.

4. **Final Conclusion**: Therefore, the correct relationship is that the assertion is true, but the reason is false. This leads us to the conclusion that the third option is correct: "Assertion is true but reason is false."