Which of the following hormones prevent water loss in urine?

Options

A. Oxytocin
B. Vasopressin
C. Somatocrinin
D. Somatostatin

Answer

To determine which hormone prevents water loss in urine, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Hormones Listed**: The options given are oxytocin, vasopressin, somatocranine, and somatostatin.

2. **Understand the Function of Each Hormone**:
- **Oxytocin**: This hormone is primarily involved in stimulating muscle contractions during childbirth and does not play a role in water retention.
- **Vasopressin (Antidiuretic Hormone - ADH)**: This hormone is produced in the hypothalamus and released from the posterior pituitary gland. Its main function is to promote water reabsorption in the kidneys, thus preventing water loss in urine.
- **Somatocranine**: This hormone is related to growth hormone release but does not have a direct role in water retention.
- **Somatostatin**: This hormone inhibits the release of several other hormones and does not affect water retention.

3. **Determine the Correct Answer**: Based on the functions of these hormones, vasopressin is the hormone that prevents water loss in urine by stimulating the kidneys to reabsorb water.

4. **Conclusion**: The correct answer is **option B: Vasopressin**.