Question: when did guardians of the galaxy come out
[{'answer': 'August 1 , 2014', 'provenance': [{'wikipedia_id': '36450985', 'title': 'Guardians of the Galaxy (film)', 'start_paragraph_id': 29, 'start_character': 168, 'end_paragraph_id': 29, 'end_character': 183, 'bleu_score': 1.0, 'section': 'Section::::Production.:Development.\n'}]}]