Q. The 1st effective vaccine against polio was prepared by:

(A) James Simpson
(B) Robert Edwards
(C) Jonas E. Salk
(D) J.H. Gibbon

✅ Correct Answer: (C) Jonas E. Salk

Published by Ram Sharma ⭐ 193.88K Points at 07-Apr-2022 08:17 pm in General Awareness

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