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 indicates : \nSelect and explain. \nA. Severity of disease, B. Prevalance of disease, C. incidence of disease, D. Morbidity of disease', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' ie Severity of disease Total no. of deaths due to a particular diseaseCase fatality rate x 100Total no. of cases due to the same diseaseIt represents the killing power of the disease.Also RememberIt's a ratio *, not rate.It is used for acute infectious diseases* its usefulness for chronic disease is limited.", 'role': 'assistant'}]