alleryবিশ্ব স্বাস্থ্য সংস্থাই (WHO) কোন বছৰত বসন্ত ৰোগ (স্মলপক্স) সম্পূৰ্ণৰূপে নিৰ্মূল হোৱা বুলি ঘোষণা কৰিছিল?
A1966
B1972
C1980
D1990
Answer & Solution
Correct answer: C. 1980
WHO-এ ১৯৮০ চনত বসন্ত ৰোগ সম্পূৰ্ণৰূপে নিৰ্মূল হোৱা বুলি ঘোষণা কৰিছিল।
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