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
Case fatality rate is 
Select and explain. 
A. Severity of disease, B. Communicability of disease, C. Burden of disease, D. None
A: Severity of disease
Answer: A: Severity of disease 
Explanation: ref: Park&;s 23rd edition pg 58 Case fatality rate is simply the ratio of deaths to cases. typically used for acute diseases like food poisoning, cholera, measles.