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This article presents a 3(1/2)-year-old child on valproic acid, lamotrigine, and phenytoin who developed simultaneous hepatotoxicity and bone marrow toxicity during a parainfluenza virus type 3 infection.
 a 3(1/2)-year-old child: Subject; 3(1/2)-year-old: Subject.Age; child: Subject.Age; simultaneous hepatotoxicity and bone marrow toxicity: Effect; valproic acid, lamotrigine, and phenytoin: Treatment; valproic acid: Treatment.Drug; lamotrigine: Treatment.Drug; phenytoin: Treatment.Drug; phenytoin: Combination.Drug; lamotrigine: Combination.Drug; valproic acid: 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 3(1/2)-year-old child: Subject; 3(1/2)-year-old: Subject.Age; child: Subject.Age; simultaneous hepatotoxicity and bone marrow toxicity: Effect; valproic acid, lamotrigine, and phenytoin: Treatment; valproic acid: Treatment.Drug; lamotrigine: Treatment.Drug; phenytoin: Treatment.Drug; phenytoin: Combination.Drug; lamotrigine: Combination.Drug; valproic acid: Combination.Drug