Answer: Antibody
Explanation:
An antibody is an immunoglobulin molecule which is large and Y shaped protein. These proteins are produced by the plasma cells. These are used by the immune system to fight against the foreign antigens or disease causing pathogens like bacteria, virus and others. The antibodies detect the antigens to kill them, or to make them less potent to cause disease. This way antibodies trigger an immune response in the body.
