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B
Woodruff
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C
Fleming and Waksman
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D
Waksman and Woodruff
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Solution
The correct option is A Waksman Waksman and his students isolated more than fifteen antibiotics. Waksman identified the first true antibiotic. He observed an antibiotic in Actinomyces antibioticus, a member of the actinomycetes family. The microbe produced a substance, actinomycin. Actinomycin had both bacteriostatic and bactericidal properties.