The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Public health researchers are reviewing data from an outbreak of hepatitis A that was traced to contaminated produce from a popular restaurant. A case series investigation with prospective and retrospective follow-up found that 500 individuals dined at the restaurant during the week of study. The incidence of hepatitis A infection was found to be 25%, and the total number of deaths recorded among the incident cases was 5 individuals. What was the case-fatality rate for the hepatitis A outbreak?   (A) 4%   (B) 10%   (C) 20%   (D) 25%
['(A) 4% <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) 4% \n (B) 10% \n (C) 20% \n (D) 25% <> possible answers', '  Public health researchers are reviewing data from an outbreak of hepatitis A that was traced to contaminated produce from a popular restaurant. A case series investigation with prospective and retrospective follow-up found that 500 individuals dined at the restaurant during the week of study. The incidence of hepatitis A infection was found to be 25%, and the total number of deaths recorded among the incident cases was 5 individuals. What was the case-fatality rate for the hepatitis A outbreak? <> context@']