Question: when did the lead singer of ac/dc die
[{'answer': '19 February 1980', 'provenance': [{'wikipedia_id': '445390', 'title': 'Bon Scott', 'start_paragraph_id': 1, 'start_character': 42, 'end_paragraph_id': 1, 'end_character': 58, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '445390', 'title': 'Bon Scott', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 242, 'bleu_score': 0.8738933016147741, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5217455724348391869}, 'section': 'Section::::Abstract.'}]}]