When did World Health Organisation officially declare the South-East Asia region Polio free ?

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Q: 111 (UPPSC/2014)
When did World Health Organisation officially declare the South-East Asia region Polio free ?
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question_subject: 

General Knowledge

question_exam: 

UPPSC

stats: 

0,4,14,4,8,4,2

keywords: 

{'east asia region polio': [0, 0, 0, 1], 'world health organisation': [2, 1, 0, 1]}