(A) Alexander Fleming discovered penicillin in $1928$ while working at St. Mary's Hospital in London. He observed that the mold $Penicillium$ $notatum

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(A) Alexander Fleming discovered penicillin in $1928$ while working at St. Mary's Hospital in London. He observed that the mold $Penicillium$ $notatum$ inhibited the growth of the bacterium $Staphylococcus$ on a culture plate. This discovery marked the beginning of the antibiotic era.