28634
CONCLUSIONS : The remifentanil - paired stimulus served as a conditioned reinforcer for nose - poking : responding depended on both the contingency between the stimulus and remifentanil and the contingency between the nose - poke and the stimulus .
 Chemical: remifentanil; Chemical: remifentanil
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: remifentanil, remifentanil 
Answer:
 Chemical: remifentanil; Chemical: remifentanil