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Development of essential thrombocythemia in a patient treated with interferon alfa and pentostatin for hairy cell leukemia.
 a patient: Subject; essential thrombocythemia: Effect; interferon alfa and pentostatin: Treatment; hairy cell leukemia: Treatment.Disorder; interferon alfa: Treatment.Drug; pentostatin: Treatment.Drug; interferon alfa: Combination.Drug; pentostatin: 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:
 a patient: Subject; essential thrombocythemia: Effect; interferon alfa and pentostatin: Treatment; hairy cell leukemia: Treatment.Disorder; interferon alfa: Treatment.Drug; pentostatin: Treatment.Drug; interferon alfa: Combination.Drug; pentostatin: Combination.Drug