Question: type of antigen that triggers an allergic reaction
[{'answer': 'allergen', 'provenance': [{'wikipedia_id': '1067469', 'title': 'Type I hypersensitivity', 'start_paragraph_id': 1, 'start_character': 152, 'end_paragraph_id': 1, 'end_character': 160, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]