Poly(lactic acid) is a biodegradable polymer that is used in 3D printing. It can be made through the polymerization of L-lactic acid (below). Will the polymer be a step-growth or chain-growth polymer? 
Definitions:
Ether
An organic compound characterized by an oxygen atom connected to two alkyl or aryl groups, known for its use as a solvent and in the formation of more complex molecules.
Cyclopentanol
A cyclical alcohol with the chemical formula C5H9OH, featuring a five-membered ring structure with a hydroxyl group.
Organic Product
A compound or substance that is derived from living organisms and contains carbon.
NaH
Sodium hydride, a chemical compound often used as a strong base in organic synthesis.
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