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By using a placebo - controlled , two - way factorial design , tolerance to cold - pressor ( CP ) pain was examined , both before and after oral administration of therapeutic doses of common opioid ( hydromorphone 2 mg ) and nonsteroidal anti - inflammatory ( ketorolac 10 mg ) analgesic agents .
 Disease: pain; Chemical: hydromorphone; Chemical: ketorolac
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: pain; Chemical: hydromorphone; Chemical: ketorolac