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': 'Case fatality rate is \nSelect and explain. \nA. Severity of disease, B. Communicability of disease, C. Burden of disease, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]