Question: The credit of developing the polio vaccine goes to--
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a.Selman Waksman
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b.John Sleeman
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c.Jonas Salk
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d.Alb E. Sabin
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e.None of them
Answer: c
 Selman Waksman b) John Sleeman c) Jonas Salk d) Alb E. Sabin e) None of them Ans. c) Jonas Salk
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