This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Definition & Concepts, Subject name: Social & Preventive Medicine
[{'content': 'The useful feility indicator where bih registration statistics do not exist or are inadequate is: \nSelect and explain. \nA. Aboion rate, B. Child-woman ratio, C. Male-female ratio, D. Net reproduction rate', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Child-Woman ratio It is no. of Children 0-4yrs of age per 1000 women of child bearing age,usually defined as 15-44 or 49 yrs of age. This ratio is used where bih registration statistics do not exist or are inadequate', 'role': 'assistant'}]