What is the Most Common Type of Antigen

Question

What is the most common type of antigen?
A)​viruses
B)foreign proteins
C)bacteria
D)parasites
E)​cancer cells

Accepted Answer

Foreign proteins are the most common type of antigens because they can be found on a variety of pathogens and foreign substances, such as bacteria, viruses, and parasites. These foreign proteins are recognized by the immune system as non-self and trigger an immune response to eliminate them. While cancer cells may also have abnormal proteins on their surface that can be recognized as non-self, they are not as common as foreign proteins found on infectious agents.