25710
A large gap opening of graphene induced by the adsorption of CO on the Al - doped site .
 Chemical: graphene; Chemical: CO; Chemical: Al
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, CO, Al 
Answer:
 Chemical: graphene; Chemical: CO; Chemical: Al