The following are multiple choice questions (with answers) about medical knowledge.   **Question:** After brushing dryness of mouth is caused by   (A) Glycol   (B) sodium Lauryl sulphate   (C) Friction due to brushing   (D) Sweetner
['(B) sodium Lauryl sulphate <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Glycol \n (B) sodium Lauryl sulphate \n (C) Friction due to brushing \n (D) Sweetner <> possible answers', '  After brushing dryness of mouth is caused by <> context@']