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: Unknown
[{'content': 'True regarding mortality rate: \nSelect and explain. \nA. Little important information about changing pattern of disease, B. Usually standardization for age and sex, C. Crude death rate includes only deaths from death certificate data, D. Standardization mortality ratio is the unexpected number of death divided by observed number of deaths in a specific group', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (Refer: K. Park’s Textbook of Preventive and Social medicine, 24th\xa0 edition, pg no: 63\nStandardized mortality ratio\n\nStandardized mortality ratio is the ratio of observed deaths by expected number of deaths\nStandardization is usually done for age > sex in order to compare death rates between the countries\nCrude death rates are estimated by SRS in India. NFHS have also given data.\nOnly deaths from death certificate data are not the only source.', 'role': 'assistant'}]