The steroid responsible for balance of water and electrolytes in our body is

Options

A. Insulin-Gluconeogenesis
B. melatonin
C. testosterone
D. Aldosterone.

Answer

To solve the question about which steroid is responsible for the balance of water and electrolytes in our body, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Options**: The question provides four options: insulin, melatonin, testosterone, and aldosterone. We need to evaluate each of these to determine which one is responsible for the balance of water and electrolytes.

2. **Evaluate Insulin**: Insulin is a hormone produced by the pancreas that primarily regulates blood glucose levels. It does not play a significant role in the balance of water and electrolytes. Therefore, insulin is not the correct answer.

3. **Evaluate Melatonin**: Melatonin is secreted by the pineal gland and is involved in regulating the circadian rhythm (the 24-hour day and night cycle). It does not have a direct role in the regulation of water and electrolytes. Thus, melatonin is also not the correct answer.

4. **Evaluate Testosterone**: Testosterone is a steroid hormone that is primarily responsible for the development of male secondary sexual characteristics and the production of sperm. It does not regulate water and electrolyte balance. Therefore, testosterone is not the correct answer.

5. **Evaluate Aldosterone**: Aldosterone is a steroid hormone produced by the adrenal glands. Its primary function is to regulate the balance of sodium and potassium in the body, which in turn helps to maintain water balance and blood pressure. This makes aldosterone the correct answer for the question.

6. **Conclusion**: Based on the evaluations, the steroid responsible for the balance of water and electrolytes in our body is **aldosterone**.

### Final Answer:
The steroid responsible for balance of water and electrolytes in our body is **aldosterone**.

---