How many of the following microorganisms are bacteria?
Aspergillus niger,Acetobacter aceti,Clostridium butylicum,Lactobacillus,Brewer's yeast,Baker's yeast,Propionibacterium shermanii,Penicillium notatum

  • A
    $4$
  • B
    $5$
  • C
    $6$
  • D
    $7$

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