Question: how many republicans are in the senate in 2018
[{'answer': '51', 'provenance': [{'wikipedia_id': '38680975', 'title': '2018 United States Senate elections', 'start_paragraph_id': 13, 'start_character': 230, 'end_paragraph_id': 13, 'end_character': 232, 'bleu_score': 1.0, 'section': 'Section::::Change in composition.:Before the elections.\n'}]}]