This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other Key Definitions & Concepts, Subject name: Social & Preventive Medicine
[{'content': 'Case fatality rate describes: \nSelect and explain. \nA. Communicability of infection, B. History of disease, C. Virulence of organism, D. Contribution of a disease among all deaths', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Case fatality rate: Deaths/cases x 100 CFR represents "Killing power of a disease". It is closely related to "Virulence of organism". It is applicable only for acute diseases. Time interval is not specified.', 'role': 'assistant'}]