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
Eradication of polio type 2 done on 
Select and explain. 
A. 12-May-14, B. 20-Sep-15, C. 14-Jul-16, D. 22-Feb-03
B: 20-Sep-15
Answer: B: 20-Sep-15 
Explanation: None