Any substance that the white blood cells recognize as foreign is known as a(n):

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An antigen is any substance that the immune system recognizes as foreign and triggers an immune response to. This can include viruses, bacteria, toxins, and other foreign substances. White blood cells, including B cells and T cells, play a key role in recognizing and responding to antigens. Gamma globulin is a type of antibody that can be used to treat certain immune system disorders, but it is not the same as an antigen. Lymph nodes are small organs in the lymphatic system that help filter and trap foreign particles, including antigens, but they are not themselves antigens.

Any Substance That the White Blood Cells Recognize as Foreign