Question: who came up with the idea of the transcontinental railroad
[{'answer': 'Dr. Hartwell Carver', 'provenance': [{'wikipedia_id': '36541', 'title': 'First Transcontinental Railroad', 'start_paragraph_id': 7, 'start_character': 100, 'end_paragraph_id': 7, 'end_character': 119, 'bleu_score': 1.0, 'section': 'Section::::Origins.\n'}]}, {'provenance': [{'wikipedia_id': '36541', 'title': 'First Transcontinental Railroad', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 437, 'bleu_score': 0.9720210313175831, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12964341921634131889}, 'section': 'Section::::Origins.\n'}]}, {'provenance': [{'wikipedia_id': '17666604', 'title': 'Hartwell Carver', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['Dr. Hartwell Carver', 'Dr. Hartwell Carver (1789 April 16, 1875) was an American doctor, businessman', 'Dr. Hartwell Carver (1789 April 16, 1875) was an American doctor, businessman, and an early promoter of what would become the Transcontinental Railroad. Carver\'s push for a railroad to connect both coasts of the United States began in 1832 with a proposal that was dismissed by Congress. Over the next several years, Carver wrote a series of articles in the "New York Courier and Enquirer" about the subject. He participated in the hammering of the Golden Spike that officially joined the Central Pacific and Union Pacific railroads on May 10, 1869 at Promontory, Utah.']}}]}, {'provenance': [{'wikipedia_id': '36541', 'title': 'First Transcontinental Railroad', 'section': 'Section::::Origins.\n', 'start_paragraph_id': 7, 'end_paragraph_id': 7, 'meta': {'evidence_span': ['Dr. Hartwell Carver', 'Dr. Hartwell Carver published an article']}}]}]