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What is the correct answer?

4

T. O. Diener discovered a new infectious agent that was smaller than viruses and have the following characteristics.
(i) It causes potato spindle tuber disease.
(ii) It has free RNA.
(iii) Molecular weight of RNA is low.
Identify the infections agent.

A. Viruses

B. Viroids

C. Virion

D. Mycoplasma