Stress emergency hormone is

Options

A. Oxytocin
B. Vasopressin
C. Adrenaline
D. Sex hormone.

Answer

### Step-by-Step Solution:

1. **Identify the Question**: The question asks for the hormone that is classified as a "stress emergency hormone" from the given options: oxytocin, vasopressin, adrenaline, or sex hormone.

2. **Analyze the Options**:
- **Oxytocin**: This hormone is primarily involved in childbirth and lactation, not directly related to stress.
- **Vasopressin**: Also known as antidiuretic hormone (ADH), it regulates water balance but is not primarily a stress hormone.
- **Adrenaline**: This hormone, also known as epinephrine, is released during stressful situations and is commonly referred to as the "emergency hormone."
- **Sex Hormone**: These hormones (like estrogen and testosterone) are related to sexual development and reproduction, not stress.

3. **Select the Correct Answer**: Based on the analysis, adrenaline is the hormone that fits the description of a "stress emergency hormone."

4. **Explain the Function of Adrenaline**:
- Adrenaline is produced by the adrenal medulla, which is the inner part of the adrenal glands.
- It is released during stressful situations, preparing the body for a "fight or flight" response.
- Its effects include increased heart rate, heightened alertness, dilation of pupils, and mobilization of energy stores (increased glucose levels in the blood).

5. **Conclude the Answer**: Therefore, the correct answer to the question "Stress emergency hormone is" is **adrenaline**.