Question: who has the most rushing tds by a qb
[{'answer': 'Cam Newton', 'provenance': [{'wikipedia_id': '3400724', 'title': 'List of National Football League records (individual)', 'start_paragraph_id': 323, 'start_character': 66, 'end_paragraph_id': 323, 'end_character': 76, 'bleu_score': 1.0, 'section': 'Section::::Rushing.:Rushing touchdowns.\n'}]}]