Question: what is the definition of an asthma attack
[{'answer': 'acute asthma exacerbation', 'provenance': [{'wikipedia_id': '44905', 'title': 'Asthma', 'start_paragraph_id': 43, 'start_character': 3, 'end_paragraph_id': 43, 'end_character': 28, 'bleu_score': 1.0, 'section': 'Section::::Diagnosis.:Classification.:Asthma exacerbation.\n'}]}, {'provenance': [{'wikipedia_id': '44905', 'title': 'Asthma', 'start_paragraph_id': 43, 'start_character': 0, 'end_paragraph_id': 43, 'end_character': 427, 'bleu_score': 0.970795021215021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15663731670966857135}, 'section': 'Section::::Diagnosis.:Classification.:Asthma exacerbation.\n'}]}]