Question: who did meryl streep play in the post
[{'answer': 'Katharine Graham', 'provenance': [{'wikipedia_id': '53404298', 'title': 'The Post (film)', 'start_paragraph_id': 1, 'start_character': 174, 'end_paragraph_id': 1, 'end_character': 190, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '53404298', 'title': 'The Post (film)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 724, 'bleu_score': 0.9074995500288051, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15843958256393470822}, 'section': 'Section::::Abstract.'}]}]