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An episode of subacute encephalopathy after the infusion of a moderate dose of methotrexate (1500 mg/m2) (MTX) is reported in a young adult with metastastic gastric cancer.
 a young adult with metastastic gastric cancer: Subject; young adult: Subject.Age; subacute encephalopathy: Effect; a moderate dose of methotrexate (1500 mg/m2) (MTX): Treatment; 1500 mg/m2: Treatment.Dosage; methotrexate: Treatment.Drug; metastastic gastric cancer: 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: 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 young adult with metastastic gastric cancer: Subject; young adult: Subject.Age; subacute encephalopathy: Effect; a moderate dose of methotrexate (1500 mg/m2) (MTX): Treatment; 1500 mg/m2: Treatment.Dosage; methotrexate: Treatment.Drug; metastastic gastric cancer: Treatment.Disorder