This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'In an outbreak of cholera in a village of 2000 population 20 cases have occured and 5 have died. Case fatality rate is \nSelect and explain. \nA. 1%, B. 0.25%, C. 5%, D. 25%', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ref: Parks 23rd edition Case fatality rate = (Total no. of deaths due to a paicular case / Total no. of cases due to the same disease) x 100 Here, CFR = (5/20) x 100= 25%', 'role': 'assistant'}]