The antibodies are

Options

A. germs
B. carbohydrates
C. proteins
D. lipids

Explanation

### Step-by-Step Solution:

1. **Definition of Antibodies**: Antibodies are specialized proteins produced by the immune system in response to foreign substances known as antigens.

2. **Formation of Antibodies**: Antibodies are formed when the body detects antigens, which can be present on pathogens like bacteria and viruses or on the surface of cells.

3. **Role of Antigens**: Antigens stimulate the immune response. When pathogens enter the body, the immune system recognizes their antigens and triggers the production of antibodies.

4. **Nature of Antibodies**: Antibodies are protein molecules, specifically globular proteins, which are synthesized by B cells that differentiate into plasma cells.

5. **Types of Antibodies**: The antibodies produced are known as immunoglobulins and can be classified into different types: IgG, IgA, IgM, IgE, and IgD.

6. **Function of Antibodies**: Once formed, antibodies bind to their specific antigens, leading to an antigen-antibody reaction. This reaction can neutralize pathogens or mark them for destruction by other immune cells.

7. **Conclusion**: Therefore, antibodies are proteinaceous molecules synthesized in response to antigens, and they play a crucial role in the immune response.