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29/07/2021 2:37 pm
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Which one of the following micro-organisms is used for production of citric acid in industries?
(1) Rhizopus nigricans
(2) Penicillium citrinum
(3) Lactobacillus bulgaris
(4) Aspergillus niger
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29/07/2021 2:38 pm
Correct option: (4) Aspergillus niger