Question: when was the last time halleys comet came
[{'answer': '1986', 'provenance': [{'wikipedia_id': '46083', 'title': "Halley's Comet", 'start_paragraph_id': 1, 'start_character': 190, 'end_paragraph_id': 1, 'end_character': 194, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '46083', 'title': "Halley's Comet", 'start_paragraph_id': 60, 'start_character': 0, 'end_paragraph_id': 60, 'end_character': 636, 'bleu_score': 0.518229794465037, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6003042707275038216}, 'section': 'Section::::History.:1986.\n'}]}]