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 best method to compare vital statistics of two populations - \nSelect and explain. \nA. Crude death rate, B. Age specific death rate, C. Age Standardized death rate, D. Multivariate mortality rate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]