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A good producer of citric acid is:

1. Pseudomonas
2. Clostridium
3. Saccharomyces
4. Aspergillus

Correct answer: Aspergillus

Solution

Aspergillus, especially Aspergillus niger, is widely used industrially to produce citric acid because it secretes large amounts during fermentation. The other options are better known for different products or metabolic roles.

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