Which statement doesn't refer to small-pox?
APrevious projects had failed.
BPeople are no longer vaccinated for it.
CThe World Health Organisation mounted a worldwide campaign to eradicate the disease.
DIt was a serious threat.
APrevious projects had failed.
BPeople are no longer vaccinated for it.
CThe World Health Organisation mounted a worldwide campaign to eradicate the disease.
DIt was a serious threat.
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