2960
Rats that received ketanserin and alfentanil exhibited less rearing and exploratory behavior at the end of the 60 - min recording period than did animals that received ketanserin alone .
 Chemical: ketanserin; Chemical: alfentanil; Chemical: ketanserin
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: ketanserin; Chemical: alfentanil; Chemical: ketanserin