66. Who discovered the first successful treatment for malaria?
A) Paul Ehrlich
B) Robert Koch
C) Louis Pasteur
D) Ronald Ross
Answer: D) Ronald Ross
67. What is the name of the process by which a liquid changes into a gas without reaching its boiling point?
A) Evaporation
B) Boiling
C) Sublimation
D) Condensation
Answer: A) Evaporation
68. Who discovered the first successful treatment for yellow fever?
A) Walter Reed
B) Robert Koch
C) Louis Pasteur
D) Selman Waksman
Answer: A) Walter Reed
69. What is the name of the process by which a gas changes into a liquid?
A) Melting
B) Boiling
C) Condensation
D) Evaporation
Answer: C) Condensation
70. Who discovered the first successful treatment for smallpox?
A) Edward Jenner
B) Robert Koch
C) Louis Pasteur
D) Selman Waksman
Answer: A) Edward Jenner
