4668
RESULTS : As described earlier , administration of ibuprofen was followed by a decrease in tonic pain but - relative to placebo - an increase in correlates of phasic pain , indicating a specific effect of ibuprofen on the interaction between the pain stimuli under these special experimental conditions .
 Chemical: ibuprofen; Disease: pain; Disease: pain; Chemical: ibuprofen; Disease: pain
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: ibuprofen; Disease: pain; Disease: pain; Chemical: ibuprofen; Disease: pain