2157
Patients were randomly allocated to either receive or not receive 1 1 fentanyl , while a third group received dexamethasone in addition to fentanyl .
 fentanyl, dexamethasone, fentanyl
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 fentanyl, dexamethasone, fentanyl