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[A] : Viruses usually have only one nucl...

[A] : Viruses usually have only one nucleic acid either DNA or RNA .
[R] : Small viruses can be crystallized .

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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