2804
Pre - treatment with ketamine produced cross - tolerance to morphine , whereas pretreatment with morphine did not induce cross - tolerance to ketamine but rather augmented the cataleptic response ; this augmentation was attributed to residual morphine in the brain .
 Chemical: ketamine; Chemical: morphine; Chemical: morphine; Chemical: ketamine; Disease: cataleptic; Chemical: morphine
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: ketamine; Chemical: morphine; Chemical: morphine; Chemical: ketamine; Disease: cataleptic; Chemical: morphine