Which of the following hormones controls the milk production in mammary glands ?

Options

A. Growth hormone
B. Prolactin
C. Oxytocin
D. Vasopressin

Answer

To determine which hormone controls milk production in mammary glands, we will analyze the options provided: growth hormone, prolactin, oxytocin, and vasopressin.

### Step-by-Step Solution:

1. **Understanding Growth Hormone**:
- Growth hormone is released by the anterior pituitary gland and is primarily responsible for growth and development in organisms.
- It does not have a role in milk production.
- **Conclusion**: Growth hormone is not the correct answer.

2. **Analyzing Prolactin**:
- Prolactin is also secreted by the anterior pituitary gland.
- Its primary function is to stimulate and regulate milk production in the mammary glands.
- **Conclusion**: Prolactin is the hormone that controls milk production, making it the correct answer.

3. **Examining Oxytocin**:
- Oxytocin is secreted by the posterior pituitary gland.
- Its main functions include stimulating uterine contractions during childbirth and facilitating milk ejection during breastfeeding.
- However, it does not regulate milk production; that role belongs to prolactin.
- **Conclusion**: Oxytocin is not the correct answer.

4. **Considering Vasopressin**:
- Vasopressin, also known as antidiuretic hormone (ADH), is secreted by the posterior pituitary gland.
- Its primary function is to regulate water reabsorption in the kidneys, not related to milk production.
- **Conclusion**: Vasopressin is not the correct answer.

### Final Answer:
The hormone that controls milk production in mammary glands is **Prolactin**.

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