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Bladder retention of urine as a result of continuous intravenous infusion of fentanyl : 2 case reports .
 Disease: retention of urine; Chemical: fentanyl
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: retention of urine, fentanyl 
Answer:
 Disease: retention of urine; Chemical: fentanyl