You are exposed to a common cold virus through contact with somebody who is sick. The cold virus is a(n) ​

A) ​antibody.
B) ​antigen.
C) ​plasma cell.
D) ​cytotoxin.

Common Cold Virus

The virus responsible for causing the common cold, characterized by symptoms such as sneezing, sore throat, and congestion.

Antigen

A substance that the immune system recognizes as foreign and can trigger an immune response, including the production of antibodies.

Antibody

Proteins produced by the immune system to identify and neutralize foreign objects like bacteria and viruses.