Question

Which of the following yields citric acid?

• A. Penicillium citrinum
• B. Aspergillus niger
• C. Saccharomyces
• D. Azospirillum
  

Answer 1

The correct option is B Aspergillus niger

Citric acid is used for a multitude of purposes around the world, most obviously as a food and drinks additive, for flavouring or as a preservative but also for purposes as diverse as soaps and detergents, hair dying, explosives, industrial pipe cleaning, photography and many more.

1.7 million metric tonnes of citric acid are produced worldwide per year, and most of that is made by Aspergillus niger.

So, the correct answer is 'Aspergillus niger'