Question: who is the hardest throwing pitcher in baseball
[{'answer': 'Aroldis Chapman', 'provenance': [{'wikipedia_id': '1377339', 'title': 'Steve Dalkowski', 'start_paragraph_id': 21, 'start_character': 547, 'end_paragraph_id': 21, 'end_character': 562, 'bleu_score': 1.0, 'section': 'Section::::Baseball career.:Pitching speed.\n'}]}, {'provenance': [{'wikipedia_id': '1377339', 'title': 'Steve Dalkowski', 'start_paragraph_id': 21, 'start_character': 0, 'end_paragraph_id': 21, 'end_character': 620, 'bleu_score': 0.866810263322752, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12671769889227804987}, 'section': 'Section::::Baseball career.:Pitching speed.\n'}]}]