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B
Streptobacillus
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C
Spirochaete
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D
Oligochaete
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Solution
The correct option is C Spirochaete Treponema pallidum is a Gram-negative bacteria which is spiral or helical in shape. It is a spirochaete bacterium. It is microaerophilic. It requires a very low concentration of oxygen. It is an obligate parasite, meaning it requires host for survival. It causes syphilis. Syphilis is a sexually transmitted disease.