Which one is not a placental hormone

Options

A. HCG
B. HPL
C. Progesterone
D. melatonin

Answer

To determine which hormone is not a placental hormone, we can follow these steps:

### Step 1: Identify the hormones secreted by the placenta.
The placenta is known to secrete several important hormones during pregnancy, including:
- Human Placental Lactogen (HPL)
- Human Chorionic Gonadotropin (hCG)
- Estrogen
- Progesterone

### Step 2: List the options provided in the question.
While the question does not specify the options, we can infer that common hormones might be included. The key hormones to consider are:
- HPL
- hCG
- Estrogen
- Progesterone
- Melatonin (which is not a placental hormone)

### Step 3: Determine which hormone is not secreted by the placenta.
From the list of hormones secreted by the placenta, we can see that:
- HPL, hCG, Estrogen, and Progesterone are all produced by the placenta.
- Melatonin, however, is produced by the pineal gland and is not a placental hormone.

### Step 4: Conclude the answer.
Therefore, the hormone that is not a placental hormone is **Melatonin**.

### Final Answer:
Melatonin is not a placental hormone.

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