(C) Viroids are infectious agents that are smaller than viruses. They were discovered by $T.O. Diener$ in $1971$. $A$ viroid consists of a short stran

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(C) Viroids are infectious agents that are smaller than viruses. They were discovered by $T.O. Diener$ in $1971$. $A$ viroid consists of a short strand of circular single-stranded $RNA$ without a protein coat (capsid). Because they lack a protein coat,they are smaller than viruses.