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Clinicians treating elderly patients with a combination of serotonergic antidepressants and atypical antipsychotics for psychotic depression should be aware of the potential for serotonin syndrome.
 elderly patients: Subject; elderly: Subject.Age; serotonin syndrome: Effect; a combination of serotonergic antidepressants and atypical antipsychotics for psychotic depression: Treatment; psychotic depression: Treatment.Disorder; serotonergic antidepressants: Treatment.Drug; atypical antipsychotics: Treatment.Drug; serotonergic antidepressants: Combination.Drug; atypical antipsychotics: 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: adverse event 
  Option: Treatment.Freq, Subject.Population, Combination.Drug, Subject.Gender, Treatment.Duration, Subject, Effect, Treatment, Treatment.Disorder, Subject.Disorder, Treatment.Route, Subject.Race, Treatment.Time_elapsed, Treatment.Dosage, Subject.Age, Treatment.Drug 
Text: {0} 
Answer:
 elderly patients: Subject; elderly: Subject.Age; serotonin syndrome: Effect; a combination of serotonergic antidepressants and atypical antipsychotics for psychotic depression: Treatment; psychotic depression: Treatment.Disorder; serotonergic antidepressants: Treatment.Drug; atypical antipsychotics: Treatment.Drug; serotonergic antidepressants: Combination.Drug; atypical antipsychotics: Combination.Drug