Use the drop-down tool to select the correct answer.

1. __________ developed the vaccine for smallpox.
2. __________ came up with a process to keep wine and milk from spoiling.
3. __________ developed the treatment Salvarsan, which laid the foundation for future antibiotics.
4. __________ is credited with inventing penicillin.
5. __________ was a nurse who changed the course of the nursing profession.