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B
3000∘A
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C
2000∘A
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D
4000∘A
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Solution
The correct option is B3000∘A Smallpox was an infectious disease caused by either of two virus variants, Variola major and Variola minor. The smallpox virus is about 3000 A in size, and is brick shaped & possesses a genome that is 200 kilobase pairs long, making it one of the largest animal viruses.