Question: when did the stock market crash in 1987
[{'answer': 'October 19 , 1987', 'provenance': [{'wikipedia_id': '314544', 'title': 'Black Monday (1987)', 'start_paragraph_id': 1, 'start_character': 53, 'end_paragraph_id': 1, 'end_character': 74, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '314544', 'title': 'Black Monday (1987)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 466, 'bleu_score': 0.71745290150239, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8961387693347286180}, 'section': 'Section::::Abstract.'}]}]