In advancing periodontal disease,subgingival oral biofilm is characterized by all of the following except which one?
A) A zone of gram-positive organisms attached to the tooth
B) A loosely adherent zone of gram-negative species attached to the pocket wall
C) Predominance of bacteria such as Porphyromonas gingivalis,Prevotella intermedia,Tannerella forsythensis,Treponema denticola,and others
D) Mutans streptococci
Correct Answer:
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