(D) Viroids are infectious agents that are smaller than viruses.They consist solely of a short strand of circular,single-stranded $RNA$.Unlike viruses

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Single-stranded $RNA$ not enclosed by a protein coat

(D) Viroids are infectious agents that are smaller than viruses.They consist solely of a short strand of circular,single-stranded $RNA$.Unlike viruses,viroids lack a protein coat (capsid).Therefore,the correct description is that they have single-stranded $RNA$ not enclosed by a protein coat.