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Edward Jenner discovered the vaccine for smallpox in:

A1798
B1857
C1876
D1929
Answer & Solution
Correct answer: A. 1798
1. A worldwide campaign later eradicated smallpox. 2. Jenner's vaccine came in 1798. 3. Pasteur's fermentation work was in 1857. _Source: syllabus Science, Chapter 2, Microorganisms: Friend and Foe._
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