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Which of the following is the most common method for citric acid production?

(a) Solid-state fermentation

(b) Submerged fermentation

(c) Surface fermentation

(d) Surface adhesion fermentation

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Right answer is (b) Submerged fermentation

Easiest explanation: Submerged fermentation is the most common method for the production of citric acid. It is the most commonly employed technique and it is estimated that about 80 % of the world production of citric acid is obtained by submerged fermentation.

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