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': 'Regarding crude bih rate all are true except \nSelect and explain. \nA. Unaffected by age distribution, B. Indicator of feility, C. Excludes the still bihs, D. Better measure of feility than general feility rate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Bih rate = Number of live bihs during the year X 1000/ estimated mid year population Unsatisfactory measure of feility because the total population is not exposed to child bearing Reference : Park&;s textbook of preventive and social medicine, 23rd edition, Page no: 488', 'role': 'assistant'}]