Question: what's the name of the pittsburgh steelers coach
[{'answer': 'Michael Pettaway Tomlin', 'provenance': [{'wikipedia_id': '4493906', 'title': 'Mike Tomlin', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4493906', 'title': 'Mike Tomlin', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 387, 'bleu_score': 0.812193379582245, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9278414518816894136}, 'section': 'Section::::Abstract.'}]}]