(D) Nylon is a type of synthetic polymer that contains repeating amide linkages $(-CONH-)$ in its backbone. Therefore,it is classified as a polyamide.

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(D) Nylon is a type of synthetic polymer that contains repeating amide linkages $(-CONH-)$ in its backbone. Therefore,it is classified as a polyamide. While it is also a condensation polymer,the most specific and descriptive classification among the given options is polyamide.