(C) The potato spindle tuber disease is caused by $Viroids$. $Viroids$ are infectious agents that consist of a short strand of circular,single-strande

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(C) The potato spindle tuber disease is caused by $Viroids$. $Viroids$ are infectious agents that consist of a short strand of circular,single-stranded $RNA$ without a protein coat. They were discovered by $T.O. Diener$ in $1971$. Unlike viruses,they are much smaller and lack the capsid structure.