The following are multiple choice questions (with answers) about medical knowledge.   **Question:** For determining periodontal disease an epidemiological survey is done by using:   (A) Gingival index (G.I.)   (B) Plaque index (P.I.)   (C) Periodontal index (P.I)   (D) None of the above
['(C) Periodontal index (P.I) <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Gingival index (G.I.) \n (B) Plaque index (P.I.) \n (C) Periodontal index (P.I) \n (D) None of the above <> possible answers', '  For determining periodontal disease an epidemiological survey is done by using: <> context@']