Question: how many keys on a concert grand piano
[{'answer': '88', 'provenance': [{'wikipedia_id': '23034', 'title': 'Piano', 'start_paragraph_id': 4, 'start_character': 33, 'end_paragraph_id': 4, 'end_character': 35, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '23034', 'title': 'Piano', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 1435, 'bleu_score': 0.982630297946195, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4440371538087350675}, 'section': 'Section::::Abstract.'}]}]