Step 1: Recall definition.
Polyamides are polymers containing \(-CONH-\) (amide) linkages.
Step 2: Analyze options.
- Teflon: poly(tetrafluoroethylene), no amide linkage.
- Nylon 6,6: condensation polymer of adipic acid and hexamethylenediamine → contains amide linkages.
- Terylene: polyester, contains ester linkages.
- Bakelite: phenol–formaldehyde resin, no amide linkage.
Step 3: Conclusion.
Hence, the correct answer is Nylon 6,6.