Who is credited with developing the first vaccine?
A
Jonas Salk
B
Albert Sabin
C
Selman Waksman
D
None
Correct Option:
D
Explanation
The first successful vaccine, for smallpox, is generally credited to Edward Jenner. Jonas Salk developed the injected polio vaccine, while Albert Sabin developed the oral polio vaccine. Therefore, "None" of the listed options is correct.
