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B
Capsid-free infectious DNA
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C
Infectious protein
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D
Bacteriophage
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Solution
The correct option is B Capsid-free infectious RNA The phenomenon of a small infectious RNA was first described by T.O. Diener As a distinct class of pathogens that do not encode any protein and lack a capsid. Hence, called capsid free infectious RNA.
So, the correct answer is 'Capsid-free infectious RNA'