This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Definitions & Concepts, Subject name: Social & Preventive Medicine
[{'content': 'Eligible couple is: \nSelect and explain. \nA. Married couple, B. Married couple with husband in reproductive age group, C. Married couple with wife in reproductive age group, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Eligible couples (ECs): A currently married couple with wife in reproductive age group (15-45 years age) ECs are in need of family planning services There will be atleast 150 - 180 ECs per 1000 population in India EC register is maintained as Sub-centre.', 'role': 'assistant'}]