Which of these best describes an antigen?

Question

Quizplus · Accepted Answer

An antigen is any component that can be specifically bound by an immune receptor, such as an antibody or T cell receptor. This can include proteins, carbohydrates, lipids, and nucleic acids, as well as foreign substances like bacteria and viruses.

Answer: E 
 While an antigen is specifically defined as a component that can be recognized by an immune receptor, an immunogen is a substance that can elicit an immune response, such as the production of antibodies or activation of T cells. Not all antigens are immunogens, but all immunogens are antigens.

Which of These Best Describes an Antigen