Who discovered Oral polio vaccine which is used now-a-daysWho discovered Oral polio vaccine which is used now-a-days  mcq given below:

Q. Who discovered Oral polio vaccine which is used now-a-days

(a) Koprowski
(b) Cox
(c) Salk
(d) Sabin

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Ans: (d) Sabin  
 

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