All hypophysiotropic hormones are peptides except

Options

A. conrticotropin releasing hormone
B. growth hormone inhibitory hormone
C. somatostatin
D. prolacting release inhibiting hormone.

Explanation

To solve the question "All hypophysiotropic hormones are peptides except," we will follow these steps:

### Step 1: Understand Hypophysiotropic Hormones
Hypophysiotropic hormones are hormones produced in the hypothalamus that regulate the secretion of hormones from the anterior pituitary gland. Most of these hormones are peptides.

### Step 2: Identify the Options
The options provided in the question include:
1. Corticotropin-releasing hormone (CRH)
2. Growth hormone-inhibiting hormone (somatostatin)
3. Prolactin-releasing hormone
4. Prolactin-inhibiting hormone (also known as dopamine)

### Step 3: Analyze Each Option
- **Corticotropin-releasing hormone (CRH)**: This is a peptide hormone that stimulates the release of adrenocorticotropic hormone (ACTH) from the pituitary gland.
- **Growth hormone-inhibiting hormone (somatostatin)**: This is also a peptide hormone that inhibits the release of growth hormone from the pituitary gland.
- **Prolactin-releasing hormone**: This is a peptide hormone that stimulates the release of prolactin from the pituitary gland.
- **Prolactin-inhibiting hormone (dopamine)**: This is not a peptide; it is an amino acid derivative (specifically, a catecholamine).

### Step 4: Conclusion
Based on the analysis, all hypophysiotropic hormones are peptides except for the prolactin-inhibiting hormone (dopamine), which is an amino acid derivative.

### Final Answer
The correct answer is **Prolactin-inhibiting hormone (Dopamine)**.

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