alleryকোন বছর WHO ঘোষণা করেছিল যে গুটিবসন্ত (smallpox) নির্মূল হয়েছে?
A1966
B1972
C1980
D1990
Answer & Solution
Correct answer: C. 1980
WHO 1980 সালে গুটিবসন্তের সম্পূর্ণ নির্মূলের কথা ঘোষণা করেছিল।
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