Question: what position does the vice president of the united states hold in the senate
[{'answer': 'President of the Senate', 'provenance': [{'wikipedia_id': '32759', 'title': 'Vice President of the United States', 'start_paragraph_id': 1, 'start_character': 332, 'end_paragraph_id': 1, 'end_character': 355, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]