Read the following statements and select the option which identify the incorrect ones:
(i) Potato spindle tuber disease and Chrysanthemum stunt disease are caused by viroids.
(ii) $T_4$ bacteriophage exhibits lytic cycle.
(iii) Retroviruses have two copies of ssRNA.
(iv) Interferon which prevent viral multiplication are glycolipid particles.

The correct option is C (iv) only
Interferons are a group of proteins called cytokines produced by WBC, fibroblasts, or T-cells as part of an immune response to a viral infection or other immune triggers. Interferons are proteinaceous in nature but not glycolipid in nature, thus interferon which prevents viral multiplication are protein particles.

So, the correct option is 'Interferon which prevents viral multiplication are glycolipid particles.'.