Question: where did union and central pacific railroads meet
[{'answer': 'Promontory , Utah', 'provenance': [{'wikipedia_id': '7734', 'title': 'Central Pacific Railroad', 'start_paragraph_id': 4, 'start_character': 978, 'end_paragraph_id': 4, 'end_character': 995, 'bleu_score': 1.0, 'section': 'Section::::Authorization and construction.\n'}]}, {'provenance': [{'wikipedia_id': '7734', 'title': 'Central Pacific Railroad', 'start_paragraph_id': 4, 'start_character': 423, 'end_paragraph_id': 4, 'end_character': 1164, 'bleu_score': 0.5375793762870611, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15056007612888320508}, 'section': 'Section::::Authorization and construction.\n'}]}]