2780
A partial recovery of bupivacaine - induced ECG alterations was observed after pretreatment of the rats with BN 52021 .
 Chemical: bupivacaine; Chemical: BN 52021
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: bupivacaine, BN 52021 
Answer:
 Chemical: bupivacaine; Chemical: BN 52021