Question: who is chief executive of marks and spencer
[{'answer': 'Stephen Joseph Rowe', 'provenance': [{'wikipedia_id': '49030505', 'title': 'Steve Rowe (businessman)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '49030505', 'title': 'Steve Rowe (businessman)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 105, 'bleu_score': 0.791261986372021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6661456152276458063}, 'section': 'Section::::Abstract.'}]}]