(A) Lactic acid is produced on an industrial scale by the bacterium $Lactobacillus$. $Aspergillus$ $niger$ is used for the production of citric acid.

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(A) Lactic acid is produced on an industrial scale by the bacterium $Lactobacillus$. $Aspergillus$ $niger$ is used for the production of citric acid. $Staphylococcus$ $aureus$ is a pathogenic bacterium. $Yeast$ ($Saccharomyces$ $cerevisiae$) is primarily used for the production of ethanol and in the baking industry.