The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Which one of the following is not used as an abrasive in the dentifrice   (A) Calcium carbonate   (B) Silica   (C) Sodium Chloride   (D) Amylase
['(D) Amylase <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Calcium carbonate \n (B) Silica \n (C) Sodium Chloride \n (D) Amylase <> possible answers', '  Which one of the following is not used as an abrasive in the dentifrice <> context@']