Question: when did guardians of the galaxy vol 2 come out
[{'answer': 'May 5 , 2017', 'provenance': [{'wikipedia_id': '43402974', 'title': 'Guardians of the Galaxy Vol. 2', 'start_paragraph_id': 28, 'start_character': 283, 'end_paragraph_id': 28, 'end_character': 295, 'bleu_score': 1.0, 'section': 'Section::::Production.:Development.\n'}]}]