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Poly ( lactic - co - glycolic acid ) ( PLGA ) nanoparticles ( NPs ) are being developed as delivery systems to improve the potency of peptide - based therapeutic cancer vaccines .
 Chemical: Poly ( lactic - co - glycolic acid ); Chemical: PLGA
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Poly ( lactic - co - glycolic acid ), PLGA 
Answer:
 Chemical: Poly ( lactic - co - glycolic acid ); Chemical: PLGA