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Despite the absence of rigidity , animals that received ketanserin ( greater than 0 . 31 mg / kg i . p . ) followed by alfentanil were motionless , flaccid , and less responsive to external stimuli than were animals receiving alfentanil alone .
 Disease: rigidity; Chemical: ketanserin; Chemical: alfentanil; Chemical: alfentanil
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:
 Disease: rigidity; Chemical: ketanserin; Chemical: alfentanil; Chemical: alfentanil