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': 'Birth rate is - \nSelect and explain. \nA. Live birth/1000 mid yr. population, B. Birth/1000 mid yr population, C. Live birth/10000 mid yr. population, D. Live birth/10,000 population of reproductive age group (15-45)', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Fertility \n\nBy fertility is meant the actual bearing of children.\nA woman\'s reproductive period is roughly from 15 to\xa045 years - a period of 30 years.\nMeasurement of fertility are :-\n\n\nBirth rate \xa0\xa0\nGeneral fertility rate (GFR)\xa0\nGeneral marital fertility rate (GMFR)\xa0\nAge specific fertility rate (ASFR) \xa0 \xa0\nAge specific marital fertility rate (ASMFR)\xa0\nTotal fertility rate (TFR) \xa0 \xa0\nTotal marital fertility rate (TMFR)\nGross reproduction rate (GRR)\nNet reproduction rate (NRR)\nChild woman ratio\nPregnancy rate\nAbortion rate\nAbortion ratio\nMarriage rate\n\nBirth rate\n\nBirth rate defined as "the number of live birth per 1000 estimated mid yr. populations in a give yr."\n\nBirth rate = Number of live birth\xa0during the year / Estimated mid year population x 1000', 'role': 'assistant'}]