Question: when did chelsea first win the fa cup
[{'answer': '1970', 'provenance': [{'wikipedia_id': '4686545', 'title': 'History of Chelsea F.C.', 'start_paragraph_id': 3, 'start_character': 171, 'end_paragraph_id': 3, 'end_character': 175, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4686545', 'title': 'History of Chelsea F.C.', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 609, 'bleu_score': 0.9329260232711301, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15376244411457487067}, 'section': 'Section::::Abstract.'}]}]