This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Indicators of Health, Subject name: Social & Preventive Medicine
[{'content': 'Virulence of a disease is indicated by: \nSelect and explain. \nA. Proportional mortality rate, B. Specific mortality rate, C. Case fatality rate, D. Amount of GDP spent on control of disease', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. (c) Case fatality rateCASE FATALITY RATE (CFR):* CFR represents 'killing power of a disease'- It is 'closely related to virulence of organism'CFR=Totalno.ofcasesduetoadiseaseTotalno.ofdeathsduetoadisease x100* CFR is a Proportion: Always expressed in percentage* CFR is the 'complement of Survival Rate', thus CFR =1 - Survival Rate* Limitations of CFR:- Time interval is not specified- Usefulness is limited for chronic diseases - CFR for the same disease may vary in different epidemics", 'role': 'assistant'}]