Question: who invented the piano and when was it invented
[{'answer': 'Bartolomeo Cristofori', 'provenance': [{'wikipedia_id': '23034', 'title': 'Piano', 'start_paragraph_id': 1, 'start_character': 75, 'end_paragraph_id': 1, 'end_character': 96, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'around the year 1700', 'provenance': [{'wikipedia_id': '23034', 'title': 'Piano', 'start_paragraph_id': 1, 'start_character': 97, 'end_paragraph_id': 1, 'end_character': 117, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '23034', 'title': 'Piano', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 786, 'bleu_score': 0.6240922949159471, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2992856662993555609}, 'section': 'Section::::Abstract.'}]}]