An insect bite may result in inflammation of that spot. This is triggered by the alarm chemicals such as

Options

A. histamine and dopamine
B. histamine and bradykinin
C. interferons and opsonin
D. interferons and histones

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the alarm chemicals that trigger inflammation at the site of an insect bite.

2. **Identifying Alarm Chemicals**: The primary alarm chemicals involved in inflammation are histamine and bradykinin.

3. **Role of Histamine**:
- Histamine is released by mast cells at the site of injury.
- It acts as a vasodilator, meaning it causes blood vessels to widen.
- This vasodilation increases blood flow to the area, leading to redness and swelling (edema).

4. **Role of Bradykinin**:
- Bradykinin is another potent molecule released during the inflammatory response.
- It enhances the effects of histamine and contributes to the overall inflammatory process.

5. **Analyzing the Options**:
- **Option 1**: Histamine and dopamine - Dopamine is a neurotransmitter and not involved in inflammation.
- **Option 2**: Histamine and bradykinin - Both are involved in the inflammatory response.
- **Option 3**: Interferons and oxoins - Interferons are related to viral infections, and oxoins are not involved in inflammation.
- **Option 4**: Interferons and histones - Interferons are related to viral infections, and histones are involved in DNA packaging.

6. **Conclusion**: The correct answer is **Option 2: Histamine and Bradykinin**, as both are alarm chemicals that trigger inflammation.