This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Demography and family planning, Subject name: Social & Preventive Medicine
[{'content': 'Which of the following is the national level system that provides annual national and state level reliable estimates of feility? \nSelect and explain. \nA. Civil registration system, B. Census, C. Ad-noc survey, D. General feility rate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: General Feility Rate (GFR):It is the "number of live bihs per 1000 women in the reproductive age-group (15-44 or 49 years) in a given year".GFR = in the same area in same year] x 1000General feility rate is a better measure of feility than the crude bih rate because the denominator is restricted to the number of women in the child-bearing age, rather than the whole population. The major weakness of this rate is that not all women in the denominator are exposed to the risk of childbih. Ref: Park; 23rd ed; Pg 488', 'role': 'assistant'}]