Question: who built the four presidents on mount rushmore
[{'answer': 'Gutzon Borglum', 'provenance': [{'wikipedia_id': '185973', 'title': 'Mount Rushmore', 'start_paragraph_id': 1, 'start_character': 162, 'end_paragraph_id': 1, 'end_character': 176, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Lincoln Borglum', 'provenance': [{'wikipedia_id': '185973', 'title': 'Mount Rushmore', 'start_paragraph_id': 1, 'start_character': 287, 'end_paragraph_id': 1, 'end_character': 302, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]