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In a postoperative patient with pre-existent myasthenia gravis, oral verapamil caused a marked exacerbation in myasthenic weakness.
 a postoperative patient with pre-existent myasthenia gravis: Subject; pre-existent myasthenia gravis: Subject.Disorder; marked exacerbation in myasthenic weakness: Effect; oral verapamil: Treatment; oral: Treatment.Route; verapamil: Treatment.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 postoperative patient with pre-existent myasthenia gravis: Subject; pre-existent myasthenia gravis: Subject.Disorder; marked exacerbation in myasthenic weakness: Effect; oral verapamil: Treatment; oral: Treatment.Route; verapamil: Treatment.Drug