Assertion :- Hypothalamus having osmoregulatory center.
Reason:- ADH from supra optic nuclei of hypothalamus controls concentration of water.

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

To analyze the given assertion and reason, we can break down the information step by step.

### Step 1: Understanding the Assertion
The assertion states that the hypothalamus has an osmoregulatory center. This is true because the hypothalamus plays a crucial role in maintaining the body's water balance. It contains osmoreceptor cells that detect changes in the osmotic pressure of the blood.

**Hint for Step 1:** Consider the role of the hypothalamus in regulating bodily functions, particularly in relation to water balance.

### Step 2: Understanding the Reason
The reason provided states that ADH (antidiuretic hormone) from the supraoptic nuclei of the hypothalamus controls the concentration of water. This is also true. The supraoptic nuclei produce ADH, which is released into the bloodstream and acts on the kidneys to promote water reabsorption, thereby controlling the concentration of water in the body.

**Hint for Step 2:** Think about how hormones affect kidney function and water retention in the body.

### Step 3: Evaluating the Relationship Between Assertion and Reason
Now, we need to determine if the reason is a correct explanation of the assertion. Since the hypothalamus has osmoregulatory functions and produces ADH, which directly influences water concentration, the reason does indeed explain the assertion.

**Hint for Step 3:** Assess whether the reason logically supports the assertion by considering how ADH functions in relation to the hypothalamus.

### Step 4: Conclusion
Both the assertion and the reason are true, and the reason correctly explains the assertion. Therefore, the correct answer is that both the assertion and reason are true, and the reason is the correct explanation of the assertion.

**Hint for Step 4:** Review the options provided and match your conclusion with the correct choice based on the analysis.

### Final Answer:
Both assertion and reason are true, and the reason is the correct explanation of the assertion.