Which of the following persons discovered and developed the first effective vaccine against polio?

Options :
  1. Robert Edwards
  2. John Heysham Gibbon
  3. Jonas E. Salk
  4. James Simpson
Answer and Explanation :-

Answer: Option 3

Explanation:

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Moja putanja spiralnog je oblika i zivot je postupno odmata. Sudjelujem, svakodnevno gubim ponesto slobode, umaram glasnice, ali uspjet cu vec zbog toga sto nisam motiviran koristoljubljem.
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