4445
Pethidine - associated seizure in a healthy adolescent receiving pethidine for postoperative pain control .
 Pethidine, seizure, pethidine, postoperative pain
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Pethidine, seizure, pethidine, postoperative pain