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A total of 40 healthy volunteers were planned to start with 600 mg rifampicin once daily from days 1-5.
 40 healthy volunteers: Subject; 40: Subject.Population; 600 mg rifampicin once daily from days 1-5: Treatment; 600 mg: Treatment.Dosage; rifampicin: Treatment.Drug; once daily: Treatment.Freq
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:
 40 healthy volunteers: Subject; 40: Subject.Population; 600 mg rifampicin once daily from days 1-5: Treatment; 600 mg: Treatment.Dosage; rifampicin: Treatment.Drug; once daily: Treatment.Freq