Question: who is playing in the community shield 2017
[{'answer': 'Chelsea', 'provenance': [{'wikipedia_id': '54228142', 'title': '2017 FA Community Shield', 'start_paragraph_id': 1, 'start_character': 346, 'end_paragraph_id': 1, 'end_character': 353, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Arsenal', 'provenance': [{'wikipedia_id': '54228142', 'title': '2017 FA Community Shield', 'start_paragraph_id': 1, 'start_character': 399, 'end_paragraph_id': 1, 'end_character': 406, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '54228142', 'title': '2017 FA Community Shield', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 752, 'bleu_score': 0.887533143300767, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5447896511883294913}, 'section': 'Section::::Abstract.'}]}]