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': 'Severity of acute diseases can be best analyzed by? \nSelect and explain. \nA. Standardized mortality ratio, B. Cause specific death rate, C. Case fatality rate, D. Age specific death rate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]