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Both had impaired lung function and abnormal computed tomographic scans, and their condition improved when nitrofurantoin was withdrawn and corticosteroid treatment commenced.
 Both had impaired lung function and abnormal computed tomographic scans: Subject; Both: Subject.Population; abnormal computed tomographic scans: Subject.Disorder; nitrofurantoin was withdrawn and corticosteroid treatment commenced: Treatment; corticosteroid: Treatment.Drug; nitrofurantoin: Treatment.Drug; impaired lung function: Treatment.Disorder
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: potential therapeutic event 
  Option: Treatment.Freq, Subject.Population, Combination.Drug, Subject.Gender, Treatment.Duration, Subject, Effect, Treatment, Treatment.Disorder, Treatment.Time_elapsed, Subject.Disorder, Subject.Race, Treatment.Route, Treatment.Dosage, Subject.Age, Treatment.Drug 
Text: {0} 
Answer:
 Both had impaired lung function and abnormal computed tomographic scans: Subject; Both: Subject.Population; abnormal computed tomographic scans: Subject.Disorder; nitrofurantoin was withdrawn and corticosteroid treatment commenced: Treatment; corticosteroid: Treatment.Drug; nitrofurantoin: Treatment.Drug; impaired lung function: Treatment.Disorder