Which of the following hormone helps in water retaining in body and prevent water loss by making hypertonic urine ?

Options

A. oxytocin
B. ADH
C. Vasopressin
D. both c and d

Answer

To solve the question regarding which hormone helps in water retention in the body and prevents water loss by making hypertonic urine, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which hormone is responsible for retaining water in the body and preventing water loss by producing hypertonic urine.

2. **Defining Hypertonic Urine**: Hypertonic urine means that the urine has a higher concentration of solutes compared to the surrounding fluid. This occurs when more water is reabsorbed in the kidneys, leading to less water in the urine and a higher concentration of solutes.

3. **Identifying Relevant Hormones**:
- **Oxytocin**: This hormone is produced by the pituitary gland and is primarily involved in childbirth and lactation. It does not play a significant role in water retention or urine concentration.
- **ADH (Antidiuretic Hormone)**: Also known as vasopressin, this hormone is crucial for water retention. It acts on the kidneys to promote the reabsorption of water, thus reducing urine volume and making the urine more concentrated (hypertonic).
- **Vasopressin**: This is another name for ADH, and it has the same function of promoting water reabsorption in the kidneys.

4. **Conclusion**: Since ADH and vasopressin refer to the same hormone that aids in water retention and the production of hypertonic urine, the correct answer to the question is both ADH and vasopressin. Therefore, the correct option is "BOTH C and D".

### Final Answer: BOTH C and D (ADH and Vasopressin)