1. Lactobacillus bulgaricus
  2. Penicillium citrinum

  3. Aspergillus Niger
  4. Rhizopus nigricans
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Option 3 : Aspergillus Niger

Aspergillus Niger is a fungus and one of the most common species of the genus Aspergillus. Niger is used in the industrial preparation of citric acid (E330) and gluconic acid (E574).
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