The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Pregnancy gingivitis is caused by:   (A) Bacteriodes melaninogenicus   (B) Actinobacillus actinomycetemcomitans   (C) Streptococcus sanguis   (D) Fusobacterium
['(A) Bacteriodes melaninogenicus <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Bacteriodes melaninogenicus \n (B) Actinobacillus actinomycetemcomitans \n (C) Streptococcus sanguis \n (D) Fusobacterium <> possible answers', '  Pregnancy gingivitis is caused by: <> context@']