Point out the odd one

Options

A. Prolactin
B. Vasopressin
C. Corticotropin
D. Noradrenaline

Answer

To solve the question of identifying the odd one out among the given hormones, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Hormones**: The four options given are:
- Prolactin
- Vasopressin
- Corticotropin (ACTH)
- Noradrenaline

2. **Determine the Source of Each Hormone**:
- **Prolactin**: Secreted by the anterior lobe of the pituitary gland.
- **Vasopressin**: Also known as antidiuretic hormone (ADH), secreted by the posterior lobe of the pituitary gland.
- **Corticotropin (ACTH)**: Secreted by the anterior lobe of the pituitary gland.
- **Noradrenaline**: Secreted by the adrenal medulla.

3. **Analyze the Functions**:
- **Prolactin**: Involved in milk production.
- **Vasopressin**: Involved in water reabsorption in the kidneys.
- **Corticotropin (ACTH)**: Stimulates the adrenal cortex to release hormones.
- **Noradrenaline**: Functions as a stress hormone and is involved in the fight-or-flight response.

4. **Identify the Odd One Out**:
- The first three hormones (Prolactin, Vasopressin, and Corticotropin) are all secreted by the pituitary gland (either anterior or posterior).
- Noradrenaline is secreted by the adrenal medulla, making it different from the others.

5. **Conclusion**:
- The odd one out is **Noradrenaline** because it is not secreted by the pituitary gland, while the other three hormones are.

### Final Answer:
The odd one out is **Noradrenaline**.

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