Biology
Medium
Question
Immunization by vaccination was first introduced by?
A
Fleming in 1945
B
Florey & Chain in 1975
C
Flore & Chain in 1795
D
Edward Jenner in 1795
✓ Official correct answer
Community credibility
Registered members can vote for the answer they believe is correct today and explain why. If the facts change after an election or news event, suggest a new option so others can vote it up.
A
Fleming in 1945
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B
Florey & Chain in 1975
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C
Flore & Chain in 1795
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D
Edward Jenner in 1795
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