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


Sorry there is no explanation for this answer. Please help others by posting your response below

How do you rate this queston?  Very Easy  Easy  Average  Above Average  Tough

Previous Question : Magnetic compass was developed as a consequence of the discovery of

Next Question : Imprinting phenomenon was discovered by

Click here for online test on Discovery & Inventions


 (Getemail alerts when others member replies)

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.
-Jasna Horvat Auron