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We describe two dark-skinned patients who developed hyperpigmented skin and tongue lesions during combination therapy with IFN and ribavirin.
 two dark-skinned patients: Subject; two: Subject.Population; dark-skinned: Subject.Race; hyperpigmented skin and tongue lesions: Effect; combination therapy with IFN and ribavirin.: Treatment; IFN: Treatment.Drug; ribavirin: Treatment.Drug; IFN: Combination.Drug; ribavirin: 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:
 two dark-skinned patients: Subject; two: Subject.Population; dark-skinned: Subject.Race; hyperpigmented skin and tongue lesions: Effect; combination therapy with IFN and ribavirin.: Treatment; IFN: Treatment.Drug; ribavirin: Treatment.Drug; IFN: Combination.Drug; ribavirin: Combination.Drug