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': 'National Guinea worm Eradication Programme was launched in - \nSelect and explain. \nA. 1972-73, B. 1975-76, C. 1980-81, D. 1983-84', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., 1983-84", 'role': 'assistant'}]