alleryWHO ने किस वर्ष चेचक (स्मॉलपॉक्स) के पूर्ण उन्मूलन की घोषणा की थी?
A1966
B1972
C1980
D1990
Answer & Solution
Correct answer: C. 1980
WHO ने 1980 में चेचक के पूर्ण उन्मूलन की आधिकारिक घोषणा की थी।
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