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': 'Denominator of crude death rate is - \nSelect and explain. \nA. 1000 live birth, B. Mid year population, C. Total number of deaths in a community, D. Total number of case population in community', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Crude death rate\n\nIt is the simplest measure of mortality.\nIt is defined as "the number of death (from all causes) per 1000 estimated mid-year population in one year, in a given place".\n\nCrude death rate = No. of death during the year / Mid-year population x 1000\nSpecific death rates \n\nWhen analysis is planned to throw light on etiology, it is essential to use specific death rates.\nThe specified death rate helps identify particular \'at risk\' group (s) for prevention.\nIt also permits comparison between different causes within same population.\nThe specific death rates may be -\n\n\nCause or disease specific, e.g. TB, cancer, accident.\nRelated to specific groups - e.g. age specific, sex specific.\n\nExamples -\nSpecific death rate due to TB = No. of deaths due to TB in year / Mid year population x 1000\nSpecific death rate for male = No. of deaths amongst males / Mid year population of males x 1000', 'role': 'assistant'}]