From your "Blended Learning" assignment, which of the following pioneers did not discover a new drug but made his mark focusing on the lack of cleanliness in hospitals and deaths after operations? This medical pioneer used carbolic acid to wash his hands, his instruments, and the bandages used in the operation which helped protect his patients from gangrene.

A) Florence Nightingale
B) Joseph Lister
C) Edward Jenner
D) Louis Pasteur