| Column $I$ | Column $II$ |
|---|---|
| $(A)$ $DJ$ Ivanowsky | $(i)$ Viroids |
| $(B)$ $MW$ Beijerinck | $(ii)$ Crystallised virus |
| $(C)$ $WM$ Stanley | $(iii)$ Contagium vivum fluidum |
| $(D)$ $TO$ Diener | $(iv)$ Mosaic disease of tobacco |
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