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

Options

A. a.Histamine and dopamine
B. b.Histamine and kinin
C. c.Interferons and opsonin
D. 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 the Process**: When an insect bites, it causes damage to the skin and underlying tissues, leading to an inflammatory response.

3. **Role of Alarm Chemicals**: The body releases certain chemicals in response to injury or irritation. These chemicals are known as alarm chemicals.

4. **Key Alarm Chemicals**: The primary alarm chemicals involved in inflammation are histamines and kinins.

5. **Source of Histamines**: Histamines are found in various cells throughout the body, including mast cells in connective tissues, basophils, and blood platelets.

6. **Source of Kinins**: Kinins are present in the blood plasma and play a role in the inflammatory response.

7. **Effects of Histamines and Kinins**: Both histamines and kinins cause vasodilation (widening of blood vessels) and increased permeability of blood vessels. This leads to increased blood flow to the site of injury, allowing white blood cells (WBCs) to reach the area and aid in tissue repair.

8. **Choosing the Correct Answer**: Among the given options, the correct pair of alarm chemicals that trigger inflammation due to an insect bite is histamines and kinins.

9. **Final Answer**: Therefore, the correct answer is **histamine and kinins**.