9955
Polyethylene Glycol and Polyethylenimine Dual - Functionalized Nano - Graphene Oxide for Photothermally Enhanced Gene Delivery .
 Chemical: Polyethylene Glycol; Chemical: Polyethylenimine; Chemical: Graphene Oxide
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Polyethylene Glycol; Chemical: Polyethylenimine; Chemical: Graphene Oxide