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 a village with population of 5000, 50 people have a disease and 10 of them died. What is case fatality rate? 
Select and explain. 
A. 1%, B. 2%, C. 0.50%, D. 20%
D: 20%
Answer: D: 20% 
Explanation: .case fatality rate is the total number of deaths due to a paicular disease divided by total number of cases due to the same disease ,total multiplied by 100.it represents the killing power of a disease.it is simply the ratio of deaths to cases.the time interval is not specified. here it is 10 by 50 multiplied by 100 equals 20 ref:park&;s textbook of preventive and social medicine,22nd edition,pg no 55