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B
Nitrosomonas
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C
Bacillus
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D
Spirillum
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Solution
The correct option is CDialister 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.'