Which of the following bacteria is a gram-negative obligate anaerobe?

Name: Which of the following bacteria is a gram-negative obligate anaerobe?
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Porphyromonas gingivalis is a gram-negative obligate anaerobe. Streptococcus sanguis is a gram-positive facultative anaerobe. Aggregator actinomycetemcomitans is a gram-negative facultative anaerobe. Tannerella forythensis is a gram-negative obligate anaerobe, but it is not exclusively an obligate anaerobe as it can also survive in low oxygen environments.

Which of the Following Bacteria Is a Gram-Negative Obligate Anaerobe