Which of the following hormones is not a steroid ?

Options

A. Vasopressin
B. Testosterone
C. Androgen
D. Aldosterone

Answer

To determine which of the following hormones is not a steroid, we can analyze each option provided:

1. **Vasopressin**:
- This hormone is also known as antidiuretic hormone (ADH).
- It is a peptide hormone, meaning it is made up of amino acids.
- Vasopressin is synthesized in the posterior pituitary gland.

2. **Testosterone**:
- This hormone is classified as a sex steroid.
- It is synthesized by Leydig cells in the testes.
- Being a steroid hormone, it is derived from cholesterol.

3. **Androgen**:
- Androgens are a group of sex steroids, which include testosterone.
- They are also synthesized in the testes and are steroid hormones.

4. **Aldosterone**:
- This hormone is a mineralocorticoid, which is a type of corticosteroid.
- Aldosterone is synthesized in the zona glomerulosa of the adrenal cortex.
- It is also a steroid hormone.

After analyzing all the options, we can conclude that:

- **Vasopressin** is the only hormone listed that is not a steroid hormone. The other three hormones (Testosterone, Androgen, and Aldosterone) are all steroid hormones.

Thus, the correct answer is **option A: Vasopressin**.