This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Health programmes in India, Subject name: Social & Preventive Medicine
[{'content': 'In reproductive and child health programme, districts are divided on the basis of - \nSelect and explain. \nA. Crude bih rate & infant moality rate, B. Crude bih rate & female literacy rate, C. Crude death rate & crude bih rate, D. Couple protection rate & infant moality rate', 'role': 'user'}, {'content': 'Answer: B \nExplanation: <p> On the basis of crude bih rate and female literacy rate, all the districts were decided into three categories. Category A(58),category B(184), category C having 256 districts. Reference:Park&;s textbook of preventive and social medicine,K.Park,23rd edition,page no:452 <\\p>', 'role': 'assistant'}]