The World Health Organization (WHO) and the UN's postal agency have released a commemorative postage stamp on 9 May to commemorate which anniversary of the eradication of smallpox? - Study24x7
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The World Health Organization (WHO) and the UN's postal agency have released a commemorative postage stamp on 9 May to commemorate which anniversary of the eradication of smallpox?

A

30th

B

40th

C

20th

D

10th

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