The following are multiple choice questions (with answers) about medical knowledge.   **Question:** The primary action of topical fluoride is a:   (A) Conversion of hydroxyapatite to fluoroapatite   (B) Decrease in the plaque bacteria   (C) Form a reservoir in saliva   (D) Improve morphology of teeth
['(A) Conversion of hydroxyapatite to fluoroapatite <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Conversion of hydroxyapatite to fluoroapatite \n (B) Decrease in the plaque bacteria \n (C) Form a reservoir in saliva \n (D) Improve morphology of teeth <> possible answers', '  The primary action of topical fluoride is a: <> context@']