Question: who is the chief executive officer of apple
[{'answer': 'Timothy Donald Cook', 'provenance': [{'wikipedia_id': '46878774', 'title': 'Tim Cook', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '46878774', 'title': 'Tim Cook', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 247, 'bleu_score': 0.8914494588000421, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15889086253325572328}, 'section': 'Section::::Abstract.'}]}]