Which of the following hormones is not secreted by human placenta?

Options

A. hCG
B. Estrogens
C. progesterone inhibits the release of LH from putuitary causing regression of corpus luteum
D. LH

Explanation

To determine which hormone is not secreted by 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 forms during pregnancy and serves as a connection between the mother and the fetus. It facilitates the exchange of nutrients, gases, and waste.

2. **Identify Hormones Secreted by the Placenta**: Common hormones secreted by the human placenta include:
- Human Chorionic Gonadotropin (HCG)
- Estrogen
- Progesterone
- Human Placental Lactogen (HPL)
- Oxytocin (to some extent)

3. **Evaluate Each Hormone**:
- **HCG (Human Chorionic Gonadotropin)**: Secreted by the placenta during pregnancy.
- **Estrogen**: Also secreted by the placenta.
- **Progesterone**: Secreted by the placenta to maintain pregnancy.
- **LH (Luteinizing Hormone)**: This hormone is not secreted by the placenta; it is produced by the anterior pituitary gland.

4. **Conclusion**: Since LH is produced by the anterior pituitary and not by the placenta, it is the correct answer to the question.

### Final Answer:
The hormone that is not secreted by the human placenta is **Luteinizing Hormone (LH)**.

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