Question: who holds the record for most home runs in a single season
[{'answer': 'Barry Bonds', 'provenance': [{'wikipedia_id': '5885166', 'title': '50 home run club', 'start_paragraph_id': 1, 'start_character': 704, 'end_paragraph_id': 1, 'end_character': 715, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]