9101
Finally , graphene oxide was reduced to graphene by further adding NaBH ( 4 ) .
 Chemical: graphene oxide; Chemical: graphene; Chemical: NaBH ( 4 )
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: graphene oxide; Chemical: graphene; Chemical: NaBH ( 4 )