Question: who was president when we pulled out of vietnam
[{'answer': 'Gerald Ford', 'provenance': [{'wikipedia_id': '32611', 'title': 'Vietnam War', 'start_paragraph_id': 123, 'start_character': 524, 'end_paragraph_id': 123, 'end_character': 535, 'bleu_score': 1.0, 'section': 'Section::::U.S. exit and final campaigns, 1973–75.\n'}]}, {'provenance': [{'wikipedia_id': '32611', 'title': 'Vietnam War', 'start_paragraph_id': 137, 'start_character': 0, 'end_paragraph_id': 137, 'end_character': 470, 'bleu_score': 0.868831394799312, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7117666313635316406}, 'section': 'Section::::U.S. exit and final campaigns, 1973–75.:Fall of Saigon.\n'}]}]