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Male , 8 week old , C57BL / 6J mice received heroin in a chronic ' intermittent ' escalating dose paradigm , or cocaine in a chronic escalating dose ' binge ' paradigm , which mimic the human pattern of opioid or cocaine abuse respectively .
 Chemical: heroin; Chemical: cocaine; Chemical: cocaine
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: heroin; Chemical: cocaine; Chemical: cocaine