27224
Human and animal studies indicate that kappa opioid receptor ( KOR ) systems are involved in ethanol drinking and dependence ( Xuei et al . , 2006 ; Walker and Koob , 2008 ; Walker et al . , 2011 ) .
 Chemical: ethanol
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: ethanol