Which of the following is a polyamide polymer?

Nylon-6,6 is a condensation polymer formed by the reaction of hexamethylenediamine and adipic acid. During this polymerization, amide linkages ($-CO-NH-$) are formed between the monomers. Therefore, Nylon-6,6 is classified as a polyamide polymer.

Teflon (polytetrafluoroethylene) and polythene are addition polymers.

Bakelite is a phenol-formaldehyde resin, which is a cross-linked condensation polymer but does not contain amide linkages.

Answer: Nylon-6,6