Which of the following hormone is not involved in the parturition?

Options

A. Prolactin
B. Oxytocin
C. Relaxin
D. Estrogen

Answer

To determine which hormone is not involved in parturition, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Parturition**: Parturition is the process of childbirth, which involves uterine contractions that help in delivering the baby.

2. **Identify Key Hormones Involved in Parturition**:
- **Oxytocin**: This hormone is crucial for stimulating uterine contractions during labor. It is released from the posterior pituitary gland and is synthesized in the hypothalamus.
- **Relaxin**: This hormone helps to relax the pubic symphysis and facilitates childbirth.
- **Estrogen**: This hormone also plays a role in preparing the uterus for labor and delivery.

3. **Evaluate the Options**:
- **Prolactin**: This hormone is secreted by the anterior pituitary gland and is primarily responsible for milk production after childbirth. It does not play a direct role in the process of parturition itself.

4. **Conclusion**: Based on the roles of these hormones, we can conclude that Prolactin is not involved in the process of parturition.

### Final Answer:
The hormone that is not involved in parturition is **Prolactin**.