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Polyvinylpyrrolidone ( PVP ) was used during the synthesis process which would assist the self - assembly of the metal nanoparticles and polymer backbones into the intercalated structure .
 Chemical: Polyvinylpyrrolidone; Chemical: PVP
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: Polyvinylpyrrolidone, PVP 
Answer:
 Chemical: Polyvinylpyrrolidone; Chemical: PVP