Question: when did the phantom of the opera open
[{'answer': '1986', 'provenance': [{'wikipedia_id': '308831', 'title': 'The Phantom of the Opera (1986 musical)', 'start_paragraph_id': 0, 'start_character': 26, 'end_paragraph_id': 0, 'end_character': 30, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'October 1986 :'}, {'answer': '9 October 1986'}, {'provenance': [{'wikipedia_id': '308831', 'title': 'The Phantom of the Opera (1986 musical)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 596, 'bleu_score': 0.914276245058609, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3728989186353385268}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '308831', 'title': 'The Phantom of the Opera (1986 musical)', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ["The Phantom of the Opera is a musical with music by Andrew Lloyd Webber and lyrics by Charles Hart. Richard Stilgoe and Lloyd Webber wrote the musical's book together. Stilgoe also provided additional lyrics. Based on the French novel of the same name by Gaston Leroux, its central plot revolves around a beautiful soprano, Christine Daaé, who becomes the obsession of a mysterious, disfigured musical genius living in the subterranean labyrinth beneath the Paris Opéra House. The musical opened in London's West End at Her Majesty's Theatre in 1986", "The Phantom of the Opera is a musical with music by Andrew Lloyd Webber and lyrics by Charles Hart. Richard Stilgoe and Lloyd Webber wrote the musical's book together.", '1986']}}]}, {'provenance': [{'wikipedia_id': '308831', 'title': 'The Phantom of the Opera (1986 musical)', 'section': 'Section::::West End and Broadway.:First preview at Sydmonton.\n', 'start_paragraph_id': 16, 'end_paragraph_id': 16, 'meta': {'evidence_span': ['Maria Björnson designed the now-iconic half-mask to replace it, and the unmasking sequence was added. Clips of this preview performance were included on the DVD of the 2004 film production. "Phantom" began previews at Her Majesty\'s Theatre in London\'s West End on 27 September 1986 under the direction of', '1986']}}]}, {'provenance': [{'wikipedia_id': '37641786', 'title': 'The Phantom of the Opera at the Royal Albert Hall', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['The Phantom of the Opera at the Royal Albert Hall is a 2011 British film adaptation of Andrew Lloyd Webber\'s 1986 musical "The Phantom of the Opera", which in turn was based on the 1910 French novel "Le Fantôme de l\'Opéra" by Gaston Leroux.', 'The Phantom of the Opera at the Royal Albert Hall is a 2011 British film adaptation of Andrew Lloyd Webber\'s 1986 musical "The Phantom of the Opera", which in turn was based on the 1910 French novel "Le Fantôme de l\'Opéra" by Gaston Leroux.', '1986']}}]}]