Who was the person who discovered the typhoid vaccine?
A. Jenner B. Ronald Ross C. Sir Almorth D. Salk
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A. Jenner B. Ronald Ross C. Sir Almorth D. Salk
A. Henry Swan B. Edward Calvin C. Hoffman D. Robert Weinberg
A. Willem Johan Kolff B. Sertumer C. Robert Koch D. Einthoven
A. Paul Enrich B. F.J.Gall C. Pincus D. Kolf