Which of the following is not a steroidal hormone?

Options

A. Progesterone
B. Insulin
C. Testosterone
D. Cortisol

Answer

To determine which of the following hormones is not a steroidal hormone, we will analyze each option provided: Progesterone, Insulin, Testosterone, and Cortisol.

### Step-by-Step Solution:

1. **Identify the Hormones**: We have four hormones to evaluate: Progesterone, Insulin, Testosterone, and Cortisol.

2. **Classify Hormones**: Hormones can be classified into different categories based on their chemical structure:
- **Steroidal Hormones**: These are derived from cholesterol and include hormones such as testosterone, progesterone, and cortisol.
- **Protein/Peptide Hormones**: These are made up of amino acids and include hormones like insulin.

3. **Analyze Each Hormone**:
- **Progesterone**: This is a steroid hormone produced by the ovaries and is involved in the menstrual cycle and pregnancy.
- **Insulin**: This is a protein hormone produced by the pancreas and is crucial for regulating blood glucose levels.
- **Testosterone**: This is a steroid hormone produced mainly in the testes and is responsible for the development of male characteristics.
- **Cortisol**: This is also a steroid hormone produced by the adrenal glands and is involved in the stress response and metabolism regulation.

4. **Determine the Non-Steroidal Hormone**: From the analysis:
- Progesterone, Testosterone, and Cortisol are all steroid hormones.
- Insulin is the only hormone among the options that is classified as a protein hormone.

5. **Conclusion**: Therefore, the hormone that is not a steroidal hormone is **Insulin**.

### Final Answer:
**Insulin** is not a steroidal hormone.

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