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Four elderly LTCF residents treated with serotonergic antidepressants including selective serotonin reuptake inhibitor (SSRI) or mirtazapine and opioids.
 Four elderly LTCF residents: Subject; Four: Subject.Population; elderly: Subject.Age; serotonergic antidepressants including selective serotonin reuptake inhibitor (SSRI) or mirtazapine and opioids: Treatment; LTCF: Treatment.Disorder; selective serotonin reuptake inhibitor: Treatment.Drug; mirtazapine: Treatment.Drug; opioids: Treatment.Drug; opioids: Combination.Drug; mirtazapine: Combination.Drug
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: potential therapeutic event 
  Option: Treatment.Freq, Subject.Population, Combination.Drug, Subject.Gender, Treatment.Duration, Subject, Effect, Treatment, Treatment.Disorder, Treatment.Time_elapsed, Subject.Disorder, Subject.Race, Treatment.Route, Treatment.Dosage, Subject.Age, Treatment.Drug 
Text: {0} 
Answer:
 Four elderly LTCF residents: Subject; Four: Subject.Population; elderly: Subject.Age; serotonergic antidepressants including selective serotonin reuptake inhibitor (SSRI) or mirtazapine and opioids: Treatment; LTCF: Treatment.Disorder; selective serotonin reuptake inhibitor: Treatment.Drug; mirtazapine: Treatment.Drug; opioids: Treatment.Drug; opioids: Combination.Drug; mirtazapine: Combination.Drug