Question

multiple choice question
what is any large molecule capable of triggering an immune response called?

antigen
macrophage
hapten
antibody

Explanation:

To solve this, we analyze each option:

• Antigen: By definition, an antigen is a large molecule (or particle) that can trigger an immune response (like antibody production or activation of immune cells).
• Macrophage: It's a type of immune cell, not a molecule triggering the response.
• Hapten: A hapten is a small molecule that needs to bind to a larger carrier to be immunogenic (trigger immune response), so it's not a large molecule on its own triggering the response.
• Antibody: Antibodies are produced in response to antigens, they don't trigger the immune response (they are part of the response).

So the correct option is the one that matches the definition of a molecule triggering immune response.

Answer:

A. Antigen