The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Persons with the greatest risk of oral cancer   (A) Have a poor oro-dental hygiene, nutritional deficiencies and are chronic alcoholics   (B) Are middle aged, have a poor oro-dental hygiene and regularly use tobacco   (C) Are old, Chronic alcoholics and regularly use tobacco   (D) Are young, have poor oro-dental hygiene and are heavy smokers
['(C) Are old, Chronic alcoholics and regularly use tobacco <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Have a poor oro-dental hygiene, nutritional deficiencies and are chronic alcoholics \n (B) Are middle aged, have a poor oro-dental hygiene and regularly use tobacco \n (C) Are old, Chronic alcoholics and regularly use tobacco \n (D) Are young, have poor oro-dental hygiene and are heavy smokers <> possible answers', '  Persons with the greatest risk of oral cancer <> context@']