Question: when did the galaxy s8+ come out
[{'answer': '21 April 2017', 'provenance': [{'wikipedia_id': '53335244', 'title': 'Samsung Galaxy S8', 'start_paragraph_id': 1, 'start_character': 358, 'end_paragraph_id': 1, 'end_character': 371, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '53335244', 'title': 'Samsung Galaxy S8', 'start_paragraph_id': 1, 'start_character': 4, 'end_paragraph_id': 1, 'end_character': 519, 'bleu_score': 0.799794685763326, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16761741411336724657}, 'section': 'Section::::Abstract.'}]}]