Hormones are chemically :

Options

A. Amino acid
B. Protein
C. Steroid
D. All

Answer

**Step-by-Step Solution:**

1. **Understanding Hormones**: Hormones are chemical messengers produced by the endocrine glands. They play a crucial role in regulating various physiological processes in the body.

2. **Types of Hormones**: Hormones can be classified based on their chemical structure. The main types include:
- **Peptide Hormones**: These are made up of amino acids and include hormones like insulin and glucagon.
- **Protein Hormones**: These are larger peptides and include hormones such as growth hormone.
- **Steroid Hormones**: These are derived from cholesterol and include hormones like cortisol, estrogen, and progesterone.
- **Amino Acid Derivatives**: Some hormones are derived from single amino acids, such as epinephrine (adrenaline) and thyroxine (T4).

3. **Conclusion**: Since hormones can be classified as amino acids, proteins, and steroids, the correct answer to the question "Hormones are chemically:" is "All" (option number 4).

---