Question: who has the most running touchdowns in nfl history
[{'answer': 'Emmitt Smith', 'provenance': [{'wikipedia_id': '3400724', 'title': 'List of National Football League records (individual)', 'start_paragraph_id': 174, 'start_character': 50, 'end_paragraph_id': 174, 'end_character': 62, 'bleu_score': 1.0, 'section': 'Section::::Rushing.:Rushing attempts.\n'}]}]