The correct answer is A. Antiviral proteins.
Interferons are a group of proteins that are produced by cells in response to infection by viruses. They act to protect other cells from infection by interfering with the virus’s ability to replicate. Interferons are also produced in response to other stimuli, such as cancer and inflammation.
Antibiotics are drugs that are used to treat bacterial infections. They work by killing bacteria or preventing them from multiplying. Antibiotics do not work against viruses.
Antigens are molecules that the body’s immune system recognizes as foreign. When an antigen is detected, the immune system produces antibodies, which are proteins that bind to the antigen and help to destroy it.
Therefore, interferons are antiviral proteins, not antibiotic proteins or antigen proteins.