Question: when did the lead singer from queen die
[{'answer': '24 November 1991', 'provenance': [{'wikipedia_id': '42068', 'title': 'Freddie Mercury', 'start_paragraph_id': 1, 'start_character': 55, 'end_paragraph_id': 1, 'end_character': 71, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]