Question: who holds the major league baseball home run record
[{'answer': 'Barry Bonds', 'provenance': [{'wikipedia_id': '886286', 'title': 'List of Major League Baseball career home run leaders', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '886286', 'title': 'List of Major League Baseball career home run leaders', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 367, 'bleu_score': 0.860927925537954, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16852074669800743608}, 'section': 'Section::::Abstract.'}]}]