Question: when did the oklahoma city bombing take place
[{'answer': 'April 19 , 1995', 'provenance': [{'wikipedia_id': '22467', 'title': 'Oklahoma City bombing', 'start_paragraph_id': 89, 'start_character': 60, 'end_paragraph_id': 89, 'end_character': 78, 'bleu_score': 1.0, 'section': 'Section::::Aftermath.:Legislation.:Oklahoma School Curriculum.\n'}]}, {'provenance': [{'wikipedia_id': '22467', 'title': 'Oklahoma City bombing', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1117, 'bleu_score': 0.8328452161099351, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9410019785783997659}, 'section': 'Section::::Abstract.'}]}]