The following are multiple choice questions (with answers) about medical knowledge.   **Question:** It is likely that cell mediated immune reactions (delayed hypersensitivity) occur in periodontitis because subjects with periodontitis have   (A) High levels of histamine in involved gingival tissue   (B) IgG antibodies reactive with plaque bacterial antigens   (C) Ttymphocytes sensitized to bacterial plaque antigens   (D) High Levels of collagenase in gingival fluids
['(C) Ttymphocytes sensitized to bacterial plaque antigens <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) High levels of histamine in involved gingival tissue \n (B) IgG antibodies reactive with plaque bacterial antigens \n (C) Ttymphocytes sensitized to bacterial plaque antigens \n (D) High Levels of collagenase in gingival fluids <> possible answers', '  It is likely that cell mediated immune reactions (delayed\nhypersensitivity) occur in periodontitis because subjects with periodontitis have <> context@']