Step 1: Understanding the Concept
Nylons are synthetic polymers with the amide linkage \(-\text{CONH}-\) repeated in the chain.
Step 2: Classification
Such polymers are called polyamides.
Polyesters have ester linkages, polythene and polystyrene are addition polymers of hydrocarbons.
Step 3: Compare the options
Nylon is a polyamide, option (D).
Final Answer:
Nylon is a polyamide.
\[ \boxed{\text{(D) }\text{Polyamide polymers}} \]