Question: who was president during the movie the post
[{'answer': 'Nixon', 'provenance': [{'wikipedia_id': '53404298', 'title': 'The Post (film)', 'start_paragraph_id': 3, 'start_character': 190, 'end_paragraph_id': 3, 'end_character': 195, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '53404298', 'title': 'The Post (film)', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 575, 'bleu_score': 0.5236651878342631, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17868757538826488713}, 'section': 'Section::::Plot.\n'}]}]