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The first antibiotic was discovered by ....

The first antibiotic was discovered by ....

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Alexander Fleming
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Which of the following statements regarding antibiotics is not correct ? (i) Antibiotics are the attenuated microorganisms which in small concentration can kill or retard the growth of other harmful microorganisms. (ii) Penicillin was the first antibiotic discovered by Alexander Fleming (1928) while working on bacterium Staphylococcus aureus. (iii) The full potential of penicillin as an effective antibiotic was established by Ernest chain and Howard Florey. (iv) Fleming, Chain and Florey were awarded the Nobel Prize in 1945

What is antibiotics?