This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'About standardization all are true except: \nSelect and explain. \nA. Age specific death rate is not needed, B. A standard population is needed, C. Population should be comparable, D. Two populations are compared', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Direct standardization Indirect Standardization Method Use actual ASDRs on the standard age structure Use standard ASDRs on the actual age structure Utility when No. of deaths in each group Population in each age group Both are available Both are unavailable ASDRs: Age specific death rate Ref: Park 25th edition Pgno: 63', 'role': 'assistant'}]