Multiple choice

Who invented smallpox vaccine?

  1. Pavlov

  2. Samuel Morse

  3. Sholes

  4. Jenner

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Edward Jenner developed the smallpox vaccine in 1796, using cowpox virus to confer immunity against smallpox. This was the first successful vaccine and led to the global eradication of smallpox in 1980. Pavlov studied conditioned reflexes, Morse invented the telegraph, and Sholes developed the typewriter.

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