The hormone which stimulates the 'let down' release of milk from Mother's breast when the baby is suckling is

Options

A. Prolactin
B. Progesterone
C. Oxytocin
D. relaxin

Answer

To solve the question regarding the hormone that stimulates the 'let down' release of milk from a mother's breast when the baby is suckling, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Hormones Listed**: The question provides four options: prolactin, progesterone, oxytocin, and relaxin.

2. **Understand the Function of Each Hormone**:
- **Prolactin**: This hormone is produced by the pituitary gland and is primarily responsible for stimulating milk production in the mammary glands. However, it does not directly cause the milk to be released.
- **Progesterone**: This hormone is produced by the ovaries and is mainly involved in regulating the menstrual cycle and maintaining pregnancy. It does not play a direct role in milk ejection.
- **Oxytocin**: This hormone is also produced by the pituitary gland and is known for its role in childbirth. It stimulates the contraction of smooth muscles, including those in the mammary glands, facilitating the ejection of milk during breastfeeding.
- **Relaxin**: This hormone is secreted by the ovaries and is involved in preparing the body for childbirth, but it does not have a role in milk ejection.

3. **Determine the Correct Answer**: Based on the functions of these hormones, oxytocin is the hormone that stimulates the 'let down' reflex, allowing milk to be released when the baby suckles.

4. **Final Answer**: The correct answer is **oxytocin**.