Question: when is the major league baseball home run hitting contest
[{'answer': 'July 10 , 2017', 'provenance': [{'wikipedia_id': '51053363', 'title': '2017 Major League Baseball Home Run Derby', 'start_paragraph_id': 1, 'start_character': 155, 'end_paragraph_id': 1, 'end_character': 169, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '51053363', 'title': '2017 Major League Baseball Home Run Derby', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 357, 'bleu_score': 0.717657185969171, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5772788869000754920}, 'section': 'Section::::Abstract.'}]}]