Antibodies that help to fight infectious agents are

Options

A. Polysaccharides
B. Amino acids
C. Proteins
D. Glucose

Answer

To answer the question "Antibodies that help to fight infectious agents are:", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Antibodies**:
- Antibodies are specialized proteins produced by the immune system. They play a crucial role in identifying and neutralizing pathogens like bacteria and viruses.

2. **Identifying the Nature of Antibodies**:
- Antibodies are classified as gamma globulins, which are a type of protein. This classification is important because it helps us determine the correct answer from the options provided.

3. **Evaluating the Options**:
- **Option 1: Polysaccharides**: These are carbohydrates and do not function as antibodies. Therefore, this option is incorrect.
- **Option 2: Amino Acids**: While amino acids are the building blocks of proteins, they do not function as antibodies themselves. Thus, this option is also incorrect.
- **Option 3: Proteins**: This option correctly identifies antibodies as proteins. This is the right answer.
- **Option 4: Glucose**: Glucose is a simple carbohydrate and does not have any role in the formation of antibodies. Hence, this option is incorrect.

4. **Conclusion**:
- Based on the analysis of the options, the correct answer is that antibodies are proteins.

### Final Answer:
Antibodies that help to fight infectious agents are **proteins** (Option 3).

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