2221
The timing of papaverine application and ongoing operative events was reviewed relative to changes in neurophysiological recordings .
 Chemical: papaverine
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: papaverine 
Answer:
 Chemical: papaverine