Before Ehrilich Began a Systematic Search for a Chemical to Kill

Multiple Choice

Before Ehrilich began a systematic search for a chemical to kill specific bacteria,the only chemotherapies available were substances derived from medicinal plants. What distinguished Ehrlich's chemotherapy research?

A) he systematically tested hundred of compounds, for their ability to destroy specific bacteria without damaging surrounding tissue
B) he used metals, such as antimony and mercury to treat diseases
C) he inoculated his own son with fluid from a cowpox blister
D) he introduced cinchona tree bark, a native American remedy to treat malaria