Vitamin B $_{12}$ is produced directly during the course of fermentation by

Ashbya gossypii

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Rhizopus stolonifer

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Saccharomyces cerevisiae

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Propionibacteria

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Solution

The correct option is C Propionibacteria
Propionibacteria is a gram-positive, rod-shaped bacteria. It has unique metabolism and produces vitamin B $_{12}$ , tetrapyrrole compounds, and propionic acid. It is also used in the probiotics and cheese industries.

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