Which of the following is not a steroid hormone?

Options

A. Aldosterone
B. Androgen
C. Estrogen
D. LH

Answer

To determine which of the following is not a steroid hormone, let's analyze each option provided:

1. **Aldosterone**: This is a steroid hormone produced by the adrenal glands. It is classified under corticosteroids and plays a crucial role in regulating sodium and potassium levels in the body.

2. **Androgen**: This refers to a group of hormones that include testosterone, which are male sex hormones. Androgens are also steroid hormones and are involved in the development of male characteristics.

3. **Estrogen**: This is a group of hormones that are primarily responsible for the development of female secondary sexual characteristics. Estrogens are also steroid hormones, derived from cholesterol.

4. **LH (Luteinizing Hormone)**: This hormone is produced by the pituitary gland and is involved in regulating the reproductive system, particularly in triggering ovulation. However, LH is not a steroid hormone; it is a peptide hormone.

Based on this analysis, the answer to the question "Which of the following is not a steroid hormone?" is **LH (Luteinizing Hormone)**.

### Step-by-Step Solution:
1. **Identify the options**: Aldosterone, Androgen, Estrogen, LH.
2. **Define steroid hormones**: Understand that steroid hormones are derived from cholesterol and include corticosteroids and sex steroids.
3. **Analyze each option**:
- Aldosterone: Confirmed as a steroid hormone.
- Androgen: Confirmed as a steroid hormone.
- Estrogen: Confirmed as a steroid hormone.
- LH: Confirmed as a non-steroid hormone (peptide hormone).
4. **Conclude**: The only option that is not a steroid hormone is LH.