Question: pianist frédéric chopin was a composer of which musical era
[{'answer': 'Romantic era', 'provenance': [{'wikipedia_id': '10823', 'title': 'Frédéric Chopin', 'start_paragraph_id': 1, 'start_character': 115, 'end_paragraph_id': 1, 'end_character': 127, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '10823', 'title': 'Frédéric Chopin', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 336, 'bleu_score': 0.8043737044829951, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 85822801360967393}, 'section': 'Section::::Abstract.'}]}]