This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'The 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: Case fatality rate (ratio)\n\nCFR represents the killing power (severity) of a disease.', 'role': 'assistant'}]