Multiple choice

In _______ vaccine for yellow fever was formulated.

  1. 1932

  2. 1931

  3. 1933

  4. 1837
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The yellow fever vaccine was formulated in 1932. The vaccine was developed by Max Theiler and colleagues, leading to Theiler's Nobel Prize in 1951. The correct answer is A (1932), not the other years listed. This was a major breakthrough in tropical medicine.

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