2532
This selective closure of the ductus arteriosus suggests that the affected twin was predisposed to hypoxia and thus was more susceptible to ductal closure in response to indomethacin exposure.
 ductal closure: Effect; indomethacin exposure: Treatment; indomethacin: Treatment.Drug; exposure: Treatment.Route
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:
 ductal closure: Effect; indomethacin exposure: Treatment; indomethacin: Treatment.Drug; exposure: Treatment.Route