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METHODS : Ethanol - na i ve male Long Evans rats were given opioid receptor antagonists either intravenously , subcutaneously , or intracranially into the ventral tegmental area ( VTA ) , followed by intravenous administration of ethanol or morphine .
 Chemical: Ethanol; Chemical: ethanol; Chemical: morphine
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; Chemical: ethanol; Chemical: morphine