input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Which of the following is the common factor for the initiation of both dental caries and periodontal disease   (A) bacterial plaque   (B) lactic acid   (C) calculus   (D) no common factor
output: ['(A) bacterial plaque <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) bacterial plaque  (B) lactic acid  (C) calculus  (D) no common factor <> possible answers', '  Which of the following is the common factor for the initiation of both dental caries and periodontal disease <> context']