Question: when was the last time manchester united won a trophy
[{'answer': 'May 2017', 'provenance': [{'wikipedia_id': '19961', 'title': 'Manchester United F.C.', 'start_paragraph_id': 74, 'start_character': 401, 'end_paragraph_id': 74, 'end_character': 409, 'bleu_score': 1.0, 'section': 'Section::::Honours.\n'}]}, {'provenance': [{'wikipedia_id': '19961', 'title': 'Manchester United F.C.', 'start_paragraph_id': 74, 'start_character': 0, 'end_paragraph_id': 74, 'end_character': 446, 'bleu_score': 0.8836158956171261, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14039906008406068371}, 'section': 'Section::::Honours.\n'}]}]