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': 'Limitation of case fatality rate- \nSelect and explain. \nA. Not useful in acute infectious disease, B. Not related to virulence, C. Time period not specified, D. It is not related to survival rate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Limitations of case fatality rate is that time period is not specified.\nCFR is typically used in acute infectious disease and is related to virulence of organism.\nCase fatality rate is the complement of survival rate.', 'role': 'assistant'}]