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Physicians should suspect pulmonary toxicity in patients with respiratory distress after gemcitabine chemotherapy, mainly in elderly patients.
 patients with respiratory distress: Subject; mainly in elderly patients: Subject; pulmonary toxicity: Effect; gemcitabine chemotherapy: Treatment; gemcitabine: Treatment.Drug; respiratory distress: Treatment.Disorder; chemotherapy: 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:
 patients with respiratory distress: Subject; mainly in elderly patients: Subject; pulmonary toxicity: Effect; gemcitabine chemotherapy: Treatment; gemcitabine: Treatment.Drug; respiratory distress: Treatment.Disorder; chemotherapy: Treatment.Route