Which of the following proteins destroy the antigen when it enters in body cell ?

Options

A. Antibodies
B. Insulin
C. chromoproteins
D. phosphoproteins

Explanation

To answer the question "Which of the following proteins destroy the antigen when it enters the body cell?" we will analyze the options provided and identify the correct one.

### Step-by-Step Solution:

1. **Understand the Question**: The question asks which protein is responsible for destroying antigens that enter the body.

2. **Identify the Options**: The options given are:
- Antibodies
- Enzymes
- Chromoproteins
- Phospholipids

3. **Analyze Each Option**:
- **Antibodies**: These are also known as immunoglobulins. They are large Y-shaped proteins produced by the immune system. Their primary function is to identify and neutralize foreign objects like bacteria and viruses (pathogens) by binding to specific molecules on these pathogens called antigens. Once bound, antibodies can neutralize the antigens or mark them for destruction by other immune cells.

- **Enzymes**: These are proteins that catalyze biochemical reactions. While they play crucial roles in various metabolic processes, they are not specifically designed to destroy antigens.

- **Chromoproteins**: These are conjugated proteins that contain a colored pigment. They are involved in various functions, such as oxygen transport (e.g., hemoglobin), but they do not play a role in antigen destruction.

- **Phospholipids**: These are not proteins but rather a class of lipids that are a major component of all cell membranes. They do not have a role in destroying antigens.

4. **Conclusion**: Based on the analysis, the correct answer is **Antibodies**. They are specifically designed to identify and neutralize antigens that enter the body.

### Final Answer:
**Antibodies** are the proteins that destroy antigens when they enter the body.

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