Smallest bacterium among the following is

Dialister pneumosintes

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Nitrosomonas

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Bacillus

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Spirillum

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Solution

The correct option is C Dialister pneumosintes
Dialister pneumosintes is a nonfermentative, anaerobic, gram-negative bacillus. It was formerly called as Bacteroides pneumosintes. It is the smallest bacteria among the given organisms. Its size is approximately 0.5×0.5×1.6 µm.
Thus, the correct answer is 'Dialister pneumosintes.'

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