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The antiinflammatory activity was evaluated using the mouse models of acute ear inflammation induced by croton oil , arachidonic acid , phenol or histamine , and chronic inflammation induced by croton oil .
 Chemical: arachidonic acid; Chemical: phenol; Chemical: histamine
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: arachidonic acid; Chemical: phenol; Chemical: histamine