Smallest bacterium among these is

Dialister

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Nitrosomonas

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Bacillus

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Spirillium.

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Solution

The correct option is C Dialister
Dialister is a genus of anaerobic, Gram-negative rod-shaped bacteria. It is the smallest bacteria. It is 0.15 to 0.3 micrometer long. Baggiatoa is the largest bacteria with the size of 16 to 45 micrometer in diameter.
Thus, the correct answer is option A.

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