Identify polyamide polymer from following.

Step-by-step solution

Polyamide identification: A polyamide contains repeating amide linkages ( - CO - NH ^- ). SBR is a rubber copolymer without amide groups. Melamine formaldehyde contains C-N bonds but is an amino resin rather than a polyamide. Bakelite is a phenol-formaldehyde resin lacking amide linkages. Nylon 6,6 forms through condensation polymerization of hexamethylenediamine and adipic acid, producing characteristic amide bonds. This makes it the polyamide among the options. Final answer: D