Question: who won the most gold metals in olympics
[{'answer': 'American swimmer Michael Phelps', 'provenance': [{'wikipedia_id': '18855244', 'title': 'List of multiple Olympic medalists', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 31, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Michael Phelps', 'provenance': [{'wikipedia_id': '18855244', 'title': 'List of multiple Olympic medalists', 'start_paragraph_id': 2, 'start_character': 17, 'end_paragraph_id': 2, 'end_character': 31, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '18855244', 'title': 'List of multiple Olympic medalists', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['American swimmer Michael Phelps is the most decorated Olympian, having won 28 medals in both individual and team events (23 gold, 3 silver, and 2 bronze). Phelps has also won more individual events than any other Olympian, with 16 medals (13 gold, 2 silver, and 1 bronze).', 'American swimmer Michael Phelps is the most decorated Olympian, having won 28 medals in both individual and team events (23 gold, 3 silver, and 2 bronze). Phelps has also won more individual events than any other Olympian, with 16 medals (13 gold, 2 silver, and 1 bronze).']}}]}]