Although we mostly associate eosinophil function with allergic cell was originally evolved to deal, most effectively with: a. antigen-antibody complexes b. helminth infections (parasites) c. pyrogens d. viral infections

The correct answer is b. helminth infections (parasites).<br /><br />Eosinophils are a type of white blood cell that play a crucial role in the immune system. While they are often associated with allergic reactions, their primary function is to combat parasitic infections, particularly helminth infections. Eosinophils release toxic granules and enzymes that can kill parasites, making them an essential component of the body's defense system against these types of infections.