1607
METHODS : Subjects ( n = 114 ) undergoing extraction of impacted third molars received either 2 % lidocaine or 0 . 5 % bupivacaine before surgery and either rofecoxib 50 mg or placebo orally 90 min before surgery and for the following 48 h .
 Chemical: lidocaine; Chemical: bupivacaine; Chemical: rofecoxib
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: lidocaine; Chemical: bupivacaine; Chemical: rofecoxib