Which one of the following is not a condensation polymer?

Polymers are classified based on their polymerization mechanism into addition and condensation polymers. Condensation polymerization involves the reaction of monomers with functional groups, resulting in the formation of a polymer and the elimination of small molecules like water or HCl. Nylon is a classic synthetic condensation polymer (polyamide). DNA is a natural condensation polymer where nucleotides link via phosphodiester bonds. Bakelite (phenol-formaldehyde resin) is also formed through condensation. In contrast, Polythene (polyethylene) is an addition polymer formed by the repeated addition of ethene monomers across their carbon-carbon double bonds without the loss of any small molecules. Therefore, Polythene is not a condensation polymer.