3115
Utilizing the intrinsic near - infrared ( NIR ) optical absorbance , in vivo graphene - based photothermal therapy has been realized , achieving excellent anti - tumor therapeutic efficacy in animal experiments .
 Chemical: graphene
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: graphene 
Answer:
 Chemical: graphene