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A 62-year-old Caucasian man with atrial fibrillation who was taking warfarin reported an episode of hematochezia; his international normalized ratio (INR) was 1.74.
 A 62-year-old Caucasian man with atrial fibrillation: Subject; 62-year-old: Subject.Age; Caucasian: Subject.Race; man: Subject.Gender; hematochezia: Effect; warfarin: Treatment; atrial fibrillation: Treatment.Disorder; warfarin: 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 62-year-old Caucasian man with atrial fibrillation: Subject; 62-year-old: Subject.Age; Caucasian: Subject.Race; man: Subject.Gender; hematochezia: Effect; warfarin: Treatment; atrial fibrillation: Treatment.Disorder; warfarin: Treatment.Drug