The following are multiple choice questions (with answers) about medical knowledge.   **Question:** In a small town with a population of 10,000 people, the prevalence of alcohol use is estimated to be 30%. A study is done with a null hypothesis that there is no association between alcohol use and gastro-oesophageal reflux disease (GERD). The data obtained shows, of the 200 alcoholics who were followed-up, 30 developed GERD; and out of the 400 non-alcoholics, 30 developed GERD. What fraction of GERD can be prevented in the general population if alcohol is no longer consumed in this town?   (A) 45/195   (B) 30/400   (C) (30/200) / (30/400)   (D) 30/200
['(A) 45/195 <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) 45/195 \n (B) 30/400 \n (C) (30/200) / (30/400) \n (D) 30/200 <> possible answers', '  In a small town with a population of 10,000 people, the prevalence of alcohol use is estimated to be 30%. A study is done with a null hypothesis that there is no association between alcohol use and gastro-oesophageal reflux disease (GERD). The data obtained shows, of the 200 alcoholics who were followed-up, 30 developed GERD; and out of the 400 non-alcoholics, 30 developed GERD. What fraction of GERD can be prevented in the general population if alcohol is no longer consumed in this town? <> context@']