1. ________ discovered the benefits of injecting humans with fluid taken    from sores on cattle infected with cowpox, a disease also known as    vaccinia.

A. William Coley
B. Edward Jenner
C. Paul Ehrlich
D. All of the above

2. In ________ genetically engineered IL-2 was approved by FDA for treating     all kinds of cancer.

A. 1908
B. 1920
C. 1980
D. 1992