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
In an outbreak of cholera in a village of 2000 population 20 cases have occured and 5 died. Case fatality rate is 
Select and explain. 
A. 1%, B. 0.25%, C. 5%, D. 25%
D: 25%
Answer: D: 25% 
Explanation: In the given question, in an outbreak of cholera in a village of 2000 population, 20 cases have occured and 5 have died. Thus, CFR= Total no. of deaths due to a disease/Total no. of cases due to that disease * 100 CFR= 5/20 * 100 = 25% And, survival rate = 1-CFR= 1-0.25 = 0.75 (75%) Ref: Park 25th edition Pgno: 66