How did pierre roux, emil behring and paul ehrlich develop effective treatment of diseases?

Pierre Roux, Emil Behring and Paul Ehrlich developed effective treatment of diseases by finding the antibody required to kill the disease.

found the antibody and developed a serum t prevent disease

Explanation:

Initially the study of why disease are caused led to the study of disease causing organisms and how our system fight to prevent the disease. This led to the discovery of immunology. The deleterious effect caused was due to the pathogen and the pathogen elaborated their protein toxins causing serious illness.

In olden days when a disease called diphtheria was killing thousands of children there were many scientists who rose to study the disease. Emil Behring, Pierre Paul Roux and Paul Ehrlich studied about the toxic effect created by the lethal disease. They studied that the antibody required to kill the diphtheria toxin can be cultured in animals. They developed an effective serum to treat the disease diphtheria which cured many children.

the answer is b for brother