Which of the following hormones is not a secretory product of human placenta?

Options

A. Huma chorionic honadotropin
B. prolacting
C. estrogen
D. progesterone

Explanation

To determine which hormone is not a secretory product of the human placenta, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of the Placenta**:
- The placenta is an organ that connects the developing fetus to the uterine wall, allowing for nutrient uptake, waste elimination, and gas exchange via the mother's blood supply.

2. **Identify Hormones Secreted by the Placenta**:
- The placenta produces several hormones during pregnancy, including:
- **Human Chorionic Gonadotropin (hCG)**: Maintains the corpus luteum and stimulates progesterone production.
- **Estrogen**: Involved in the regulation of various physiological processes during pregnancy.
- **Progesterone**: Essential for maintaining the pregnancy and preventing uterine contractions.
- **Relaxin**: Helps in the relaxation of the pelvic ligaments and the cervix.
- **Human Placental Lactogen (HPL)**: Plays a role in metabolism and fetal growth.

3. **Evaluate the Options**:
- Given options:
1. Human Chorionic Gonadotropin (hCG)
2. Prolactin
3. Estrogen
4. Progesterone
- From the hormones listed, we need to identify which one is not secreted by the placenta.

4. **Identify the Non-Placental Hormone**:
- **Prolactin** is primarily secreted by the anterior pituitary gland and is responsible for milk production after childbirth. It is not produced by the placenta.

5. **Conclusion**:
- The hormone that is not a secretory product of the human placenta is **Prolactin** (Option 2).

### Final Answer:
- **Prolactin** is not a secretory product of the human placenta.