Which of the following hormones is produced only during pregnancy ?

Options

A. Prolactin
B. FSH
C. hPL
D. Cortisol

Answer

To determine which hormone is produced only during pregnancy, let's analyze each option provided in the question:

1. **Prolactin**:
- Prolactin is a hormone produced by the pituitary gland.
- Its primary role is to regulate the growth of mammary glands and stimulate milk production (lactation) after childbirth.
- While it is crucial during pregnancy and lactation, it is not exclusive to pregnancy as it continues to be produced during breastfeeding.

2. **FSH (Follicle Stimulating Hormone)**:
- FSH is also produced by the pituitary gland.
- It plays a significant role in the reproductive processes of both males and females, particularly in the development of ovarian follicles in females.
- Like prolactin, FSH is not exclusive to pregnancy; it is produced throughout the menstrual cycle.

3. **HPL (Human Placental Lactogen)**:
- HPL is produced by the placenta during pregnancy.
- Its primary function is to regulate maternal metabolism and promote lactation.
- This hormone is unique to pregnancy and is not produced in non-pregnant individuals.

4. **Cortisol**:
- Cortisol is a hormone produced by the adrenal glands.
- It is involved in various bodily functions, including the regulation of metabolism and the immune response.
- Cortisol is not exclusive to pregnancy; it is produced under normal physiological conditions as well.

Based on this analysis, the hormone that is produced only during pregnancy is **HPL (Human Placental Lactogen)**.

### Final Answer:
**HPL (Human Placental Lactogen)** is the hormone produced only during pregnancy.