The first antibiotic was discovered accidentally by $A$ while working on $B$.

  • A
    $A-$Waksman; $B-$Streptococcus
  • B
    $A-$Fleming; $B-$Penicillium notatum
  • C
    $A-$Waksman; $B-$Bacillus brevis
  • D
    $A-$Fleming; $B-$Staphylococci

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