The hormone which regulates the growth of mammary gland and formation of milk in them is secreted by

Options

A. The gland attached to the hypothalamus by a stalk
B. The gland situated at the base of diencephalon
C. The gland situated near the trachea
D. The gland situated near the aorta

Answer

To solve the question about which hormone regulates the growth of mammary glands and the formation of milk, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Hormone**: The hormone responsible for regulating the growth of mammary glands and milk production is known as Prolactin.

2. **Determine the Source of Prolactin**: Prolactin is secreted by the anterior pituitary gland, which is also referred to as the adenohypophysis.

3. **Analyze the Options**:
- **Option A**: The gland attached to the hypothalamus by a stalk (this refers to the pituitary gland).
- **Option B**: The gland situated at the base of the diencephalon (this refers to the hypothalamus).
- **Option C**: The gland near the trachea (this refers to the thyroid gland).
- **Option D**: The gland situated near the aorta (this refers to the adrenal gland).

4. **Select the Correct Option**: Since Prolactin is secreted by the anterior pituitary gland, which is attached to the hypothalamus by a stalk, the correct option is **Option A**.

### Final Answer:
The hormone which regulates the growth of mammary glands and formation of milk in them is secreted by the **anterior pituitary gland** (Option A).