Question: where does a baker's cyst come from
[{'answer': 'knee arthritis', 'provenance': [{'wikipedia_id': '730377', 'title': "Baker's cyst", 'start_paragraph_id': 7, 'start_character': 63, 'end_paragraph_id': 7, 'end_character': 77, 'bleu_score': 1.0, 'section': 'Section::::Cause.\n'}]}, {'provenance': [{'wikipedia_id': '730377', 'title': "Baker's cyst", 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 381, 'bleu_score': 0.96746874041754, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16932408132075708664}, 'section': 'Section::::Cause.\n'}]}]