The large holes in Swiss cheese are due to the production of a large amount of $A$ by a bacterium $B$. Here $A$ and $B$ refer to:

  • A
    $A - CO_2; B - \text{Penicillium roqueforti}$
  • B
    $A - CO_2; B - \text{Propionibacterium sharmanii}$
  • C
    $A - CO_2; B - \text{Penicillium notatum}$
  • D
    $A - CO_2; B - \text{Saccharomyces cerevisiae}$

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