Question: who is the all time stolen base leader
[{'answer': 'Rickey Henderson', 'provenance': [{'wikipedia_id': '12181006', 'title': 'List of Major League Baseball career stolen bases leaders', 'start_paragraph_id': 2, 'start_character': 2, 'end_paragraph_id': 2, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '12181006', 'title': 'List of Major League Baseball career stolen bases leaders', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 792, 'bleu_score': 0.9587603991369311, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13589324866804806020}, 'section': 'Section::::Abstract.'}]}]