Match the column I with column II :- 
(i) Viroid → (c) Potato spindle tuber disease
Viroids are small RNA pathogens affecting plants(ii) Virus → (d) Mumps
Mumps is a viral disease in humans(iii) Bacteria → (b) Citrus canker
Citrus canker is caused by bacteria(iv) Prion → (a) Creutzfeldt-Jakob disease (CJD)
Prions are infectious proteins causing neurodegenerative diseases
Hence, correct matching is Option (3).
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