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Arrays of microneedles comprised of drug - loaded poly ( lactide - co - glycolide ) ( PLGA ) microparticles or solid PLGA tips were prepared with a supporting and rapidly water - soluble poly ( acrylic acid ) ( PAA ) matrix .
 poly ( lactide - co - glycolide ), PLGA, PLGA, poly ( acrylic acid ), PAA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 poly ( lactide - co - glycolide ), PLGA, PLGA, poly ( acrylic acid ), PAA