Question: who has trained the most melbourne cup winners
[{'answer': 'Bart Cummings', 'provenance': [{'wikipedia_id': '20485', 'title': 'Melbourne Cup', 'start_paragraph_id': 61, 'start_character': 660, 'end_paragraph_id': 61, 'end_character': 673, 'bleu_score': 1.0, 'section': 'Section::::History.:Early years.\n'}]}, {'provenance': [{'wikipedia_id': '20485', 'title': 'Melbourne Cup', 'start_paragraph_id': 132, 'start_character': 0, 'end_paragraph_id': 132, 'end_character': 102, 'bleu_score': 0.8702397637697911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2459672812349887468}, 'section': 'Section::::Results and records.:Most wins by a trainer.\n'}]}, {'provenance': [{'wikipedia_id': '20485', 'title': 'Melbourne Cup', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2459672812349887468}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '20485', 'title': 'Melbourne Cup', 'start_paragraph_id': 61, 'start_character': 0, 'end_paragraph_id': 61, 'end_character': 825, 'bleu_score': 0.9868845362499331, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2459672812349887468}, 'section': 'Section::::History.:Early years.\n'}]}, {'provenance': [{'wikipedia_id': '25089743', 'title': 'The Cup (book)', 'section': 'Section::::Plot summary.:Part one.\n', 'start_paragraph_id': 9, 'end_paragraph_id': 9, 'meta': {'evidence_span': ['since been selected by Sport Australia Hall of Fame as one of the most memorable moments in the country\'s sporting history. Australian director Simon Wincer wrote the book\'s foreword. The first six chapters of The Cup introduce the individuals and the events leading up to the 2002 Melbourne Cup, including background on Dermot Weld ("The Irish Wizard"), Sheikh Mohammed bin Rashid al Maktoum ("The Sheikh"), the race itself ("The Melbourne Cup"), legendary trainer Bart Cummings ("The Cups King"), Dermot Weld\'s historic victory in the 1993 Melbourne Cup ("A Vintage Performance"), and the internationalization of the Melbourne Cup ("The World Comes Calling").', 'legendary trainer Bart Cummings ("The Cups King"),']}}]}, {'provenance': [{'wikipedia_id': '3018277', 'title': 'Harry White (jockey)', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['He usually rode for the "cups king" Bart Cummings.', 'He rode the winners of four Melbourne Cups']}}]}, {'provenance': [{'wikipedia_id': '1758185', 'title': 'Bart Cummings', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ["James Bartholomew Cummings (14 November 1927 30 August 2015), also known by his initials J. B. Cummings, was one of the most successful Australian racehorse trainers. He was known as the Cups King, referring to the Melbourne Cup, as he won 'the race that stops a nation' a record twelve times. During his lifetime Cummings was considered an Australian cultural icon and an Australian National Living Treasure. As a racing icon he was generally considered in the 20th century, equivalent as what Etienne L. de Mestre had been in the 19th century.", 'James Bartholomew Cummings (14 November 1927 30 August 2015), also known by his initials J. B. Cummings, was one of the most successful Australian racehorse trainers. He was known as the Cups King,', "James Bartholomew Cummings (14 November 1927 30 August 2015), also known by his initials J. B. Cummings, was one of the most successful Australian racehorse trainers. He was known as the Cups King, referring to the Melbourne Cup, as he won 'the race that stops a nation' a record twelve times."]}}]}]