Question: when did the shah come to the us
[{'answer': '22 October 1979', 'provenance': [{'wikipedia_id': '20065598', 'title': 'Mohammad Reza Pahlavi', 'start_paragraph_id': 140, 'start_character': 3, 'end_paragraph_id': 140, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::Exile.\n'}]}, {'provenance': [{'wikipedia_id': '20065598', 'title': 'Mohammad Reza Pahlavi', 'start_paragraph_id': 140, 'start_character': 0, 'end_paragraph_id': 140, 'end_character': 1638, 'bleu_score': 0.9928442500246331, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9918169706133210555}, 'section': 'Section::::Exile.\n'}]}]