Question: who was in charge of building the golden gate bridge
[{'answer': 'McClintic - Marshall Construction Co.', 'provenance': [{'wikipedia_id': '12103', 'title': 'Golden Gate Bridge', 'start_paragraph_id': 24, 'start_character': 67, 'end_paragraph_id': 24, 'end_character': 103, 'bleu_score': 1.0, 'section': 'Section::::History.:Construction.\n'}]}, {'answer': 'Bethlehem Steel Corporation', 'provenance': [{'wikipedia_id': '12103', 'title': 'Golden Gate Bridge', 'start_paragraph_id': 24, 'start_character': 120, 'end_paragraph_id': 24, 'end_character': 147, 'bleu_score': 1.0, 'section': 'Section::::History.:Construction.\n'}]}, {'provenance': [{'wikipedia_id': '12103', 'title': 'Golden Gate Bridge', 'start_paragraph_id': 24, 'start_character': 0, 'end_paragraph_id': 24, 'end_character': 229, 'bleu_score': 0.528229681978123, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 678768033116376013}, 'section': 'Section::::History.:Construction.\n'}]}]