Antigen is :-A Substances which stimulates the production of venom B Vaccine C Antibody production stimulating agent D Part of the body defence system

Understanding Antigens

An antigen is commonly defined as a substance that induces an immune response in the body, particularly the production of antibodies. This can include a wide variety of substances, such as proteins, polysaccharides, and even certain cells.

Options Analysis

1. A: Substances which stimulate the production of venom

   • This option is misleading. Antigens do not directly cause the production of venom; instead, they trigger immune responses.

2. B: Vaccine

   • While vaccines often contain antigens to stimulate an immune response, this choice does not directly define what an antigen is.

3. C: Antibody production stimulating agent

   • This description accurately represents the role of an antigen. It directly stimulates the body’s immune system to produce antibodies.

4. D: Part of the body defence system

   • This option is somewhat vague. While antigens play a role in the immune response, they are not a part of the immune system itself but rather external substances that provoke a response.

Conclusion

The best answer to the question is C: Antibody production stimulating agent. This choice correctly defines the role of an antigen in the immune response process.