69. Antigen is a substance which A.Lowers body temperature B.Destroys harmful bacteria C.Triggers the immune system D.Is used as an antidote to poison
Answer: Option C Solution: An antigen is any substance that causes your immune system to produce antibodies against it. This means your immune system does not recognize the substance, and is trying to fight it off. An antigen may be a substance from the environment, such as chemicals, bacteria, viruses, or pollen.
