Who developed the Polio Vaccine?
A. Jonas Edward Salk
B. Rene Laennec
C. Henri Gifford
D. Alexander Fleming
Answer
Correct Answer: D. A. Jonas Edward Salk (1952)
A. Jonas Edward Salk
B. Rene Laennec
C. Henri Gifford
D. Alexander Fleming
Correct Answer: D. A. Jonas Edward Salk (1952)