2607
METHOD : Twenty cocaine - dependent participants were randomly assigned to receive modafinil , 400 mg ( N = 10 ) , or placebo ( N = 10 ) every morning at 7 : 30 a . m . for 16 days in an inpatient , double - blind randomized trial .
 Chemical: cocaine; Chemical: modafinil
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: cocaine, modafinil 
Answer:
 Chemical: cocaine; Chemical: modafinil