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': 'In crude death rate the population is taken as on - \nSelect and explain. \nA. 1st March, B. 1st July, C. 1st April, D. 15th August', 'role': 'user'}, {'content': 'Answer: B \nExplanation: A rate comprises the following elements →\n\ni) Numerator\nii) Denominator\niii) Time specification\xa0 \xa0 \xa0 \xa0\niv) Multiplier\nNumerator → Refers to the number of times an event (e.g. sickness, birth, death) has occurred in a population, during a specified time period. Numerator is a component of the denominator in calculating a rate, but not in a ratio.\nDenominator → Denominator may be :-\ni) Related to population\nMid year population → population estimated on first of July of an year\nPopulation at risk\nPerson - time\nPerson distance\nii) Related to total events\n\xa0As in case fatality rate, denominator is total number of cases rather than total population.', 'role': 'assistant'}]