Question: when did valerian and the city of a thousand planets come out
[{'answer': '21 July 2017', 'provenance': [{'wikipedia_id': '49027117', 'title': 'Valerian and the City of a Thousand Planets', 'start_paragraph_id': 2, 'start_character': 48, 'end_paragraph_id': 2, 'end_character': 60, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '49027117', 'title': 'Valerian and the City of a Thousand Planets', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 381, 'bleu_score': 0.558645111985118, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14889348195839667783}, 'section': 'Section::::Abstract.'}]}]