A) fumaric acid
B) acetic acid
C) lactic acid
D) citric acid and gluconic acid
Correct Answer: D
Solution :
Aspergillus niger produces Citric acid and gluconic acid citric acid is used by Mucor species and yeast (when medium is deficient in Fe and Mn) and also be used in medicines engraving, dyeing, etc. Because citric acid is preservative and flavouring agent.
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