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': 'When was the International Drinking Water Supply and Sanitation Decade Programme launched? \nSelect and explain. \nA. 1975, B. 1978, C. 1984, D. 1981', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The International Drinking Water Supply and Sanitation Decade Programme launched in 1981. Targets set were 100 percentage for water, both urban and rural, 80% for urban sanitation and 25% for rural sanitation. Ref: Park 21st edition, page 397.', 'role': 'assistant'}]