2801
A 75-year-old man developed bilateral lower leg edema 6 months after switching from troglitazone to pioglitazone.
 A 75-year-old man: Subject; 75-year-old: Subject.Age; man: Subject.Gender; bilateral lower leg edema: Effect; 6 months after switching from troglitazone to pioglitazone: Treatment; pioglitazone: Treatment.Drug; 6 months: Treatment.Drug; troglitazone: Treatment.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:
 A 75-year-old man: Subject; 75-year-old: Subject.Age; man: Subject.Gender; bilateral lower leg edema: Effect; 6 months after switching from troglitazone to pioglitazone: Treatment; pioglitazone: Treatment.Drug; 6 months: Treatment.Drug; troglitazone: Treatment.Drug