This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'Eligible couple is defined as: March 2005 \nSelect and explain. \nA. Married couple with husband age 20-40, B. Married couple with wife age 15-45, C. Married couple irrespective of the age group, D. Just married', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: Married couple with wife age An eligible couple refers to a currently married couple wherein the wife is in reproductive age group, which is generally assumed to lie between the ages of 15-45. There will be at least 150-180 such couples per 1000 population in India.', 'role': 'assistant'}]