Question: who has won the most masters green jackets
[{'answer': 'Jack Nicklaus', 'provenance': [{'wikipedia_id': '16354524', 'title': 'List of Masters Tournament champions', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 13, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '16354524', 'title': 'List of Masters Tournament champions', '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': 8070336754665967136}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '16354524', 'title': 'List of Masters Tournament champions', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 587, 'bleu_score': 0.9575690457118191, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8070336754665967136}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '30873530', 'title': "List of men's major championships winning golfers", 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['Nicklaus also holds the record for the most victories in the Masters, winning the tournament six times.', 'in 2000 and the Masters in 2001; a feat dubbed the "Tiger slam". Jack Nicklaus has won the most majors, achieving 18 victories during his career', 'Jack Nicklaus']}}]}, {'provenance': [{'wikipedia_id': '157211', 'title': 'Masters Tournament', 'section': 'Section::::Champions.\n', 'start_paragraph_id': 106, 'end_paragraph_id': 106, 'meta': {'evidence_span': ['The player with the most Masters victories is Jack Nicklaus, who won six times between 1963 and 1986.', 'The player with the most Masters victories is Jack Nicklaus, who won six times between 1963 and 1986', 'Jack Nicklaus']}}]}, {'provenance': [{'wikipedia_id': '16354524', 'title': 'List of Masters Tournament champions', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['Jack Nicklaus holds the record for the most Masters victories, winning the tournament six times during his career.', 'Jack Nicklaus holds the record for the most Masters victories, winning the tournament six times during his career. Nicklaus is also the oldest winner of the Masters:', 'Jack Nicklaus']}}]}]