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This study was designed to describe pain tolerance and analgesic response in a sample of opioid addicts stabilized in methadone - maintenance ( MM ) treatment ( n = 60 ) in comparison to matched nondependent control subjects ( n = 60 ) .
 Disease: pain; Disease: opioid addicts; Chemical: methadone
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; Disease: opioid addicts; Chemical: methadone