Question: when did the shah of iran take power
[{'answer': '16 September 1941', 'provenance': [{'wikipedia_id': '20065598', 'title': 'Mohammad Reza Pahlavi', 'start_paragraph_id': 1, 'start_character': 139, 'end_paragraph_id': 1, 'end_character': 156, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '20065598', 'title': 'Mohammad Reza Pahlavi', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 687, 'bleu_score': 0.7833563603544951, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11414734977696372358}, 'section': 'Section::::Abstract.'}]}]