(B) In $1971$,$T.O. Diener$ discovered a new infectious agent that was smaller than viruses and caused potato spindle tuber disease. This infectious a

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(B) In $1971$,$T.O. Diener$ discovered a new infectious agent that was smaller than viruses and caused potato spindle tuber disease. This infectious agent was named 'viroid'. Viroids consist of a short strand of low molecular weight $RNA$ and lack a protein coat.