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# Which of the following is a plasticizer?

$\begin{array}{1 1}(a)\;\text{cresyl phthalate}&(b)\; \text{formaldehyde resin}\\(c)\;\text{PVC}&(d)\;\text{nylon}\end{array}$

Cresyl phthalate is a plasticizer and is used to make PVC soft so that it can be reused.
Hence (a) is the correct answer.