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Who discovered the second type of Polio Vaccine?

A. Janas Salk
B. Robert Koch
C. Albert Sabin
D. Sigmund Freud

Answer & Solution
Option: C
Explanation :In the 1960s a second type of polio vaccine, known as oral poliovirus vaccine (OPV) or Sabin vaccine, named for its inventor American physician and microbiologist Albert Sabin, was developed. OPV contains live attenuated (weakened) virus and is given orally.
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