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
When was the International Drinking Water Supply and Sanitation Decade Programme launched? 
Select and explain. 
A. 1975, B. 1978, C. 1984, D. 1981
D: 1981
Answer: D: 1981 
Explanation: 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.