Question: who plays the chairman in memoirs of a geisha
[{'answer': 'Ken Watanabe', 'provenance': [{'wikipedia_id': '901398', 'title': 'Memoirs of a Geisha', 'start_paragraph_id': 23, 'start_character': 194, 'end_paragraph_id': 23, 'end_character': 206, 'bleu_score': 1.0, 'section': 'Section::::Film version.\n'}]}, {'provenance': [{'wikipedia_id': '901398', 'title': 'Memoirs of a Geisha', 'start_paragraph_id': 23, 'start_character': 0, 'end_paragraph_id': 23, 'end_character': 313, 'bleu_score': 0.9632870032952191, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12532561996262068215}, 'section': 'Section::::Film version.\n'}]}]