19917
There were no differences between the control animals and the cocaine or heroin treated animals in neither of the tissues examined , which is surprising since cocaine administration induced gross morphological changes in the liver .
 Chemical: cocaine; Chemical: heroin; 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: cocaine; Chemical: heroin; Chemical: cocaine