| Column $I$ | Column $II$ |
| $(a)$ Potato spindle tuber | $(i)$ Virus |
| $(b)$ Creutzfeldt-Jakob disease $(CJD)$ | $(ii)$ Viroid |
| $(c)$ Cholera | $(iii)$ Prion |
| $(d)$ Leaf rolling and curling | $(iv)$ Bacteria |
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