You are at question (MCQ) number 9 and Test Number 2 of Biology: All topics. To deal with Biology questions, you must take lesson on the subject. In case of science and Art subjects revise your text books and in case of general aptitude topics take lessons from the topic page.
The question: Who discovered the polio vaccine?
.... with options: Alexander Flemming, Jones Salk, Robert Koach, Edward Genere can be solved with the concepts and understanding of Biology.
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