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Etching of PVP from the PLLA - PVP composite fibers doped with increasing PVP concentrations yielded PLLA fibers with increasing nano - scale surface roughness and porosity , which increased the fiber hydrophilicity dramatically .
 Chemical: PVP; Chemical: PLLA; Chemical: PVP; Chemical: PVP; Chemical: PLLA
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: PVP, PLLA, PVP, PVP, PLLA 
Answer:
 Chemical: PVP; Chemical: PLLA; Chemical: PVP; Chemical: PVP; Chemical: PLLA