Question: what is the r in a circle symbol
[{'answer': 'the registered trademark symbol'}, {'provenance': [{'wikipedia_id': '6512472', 'title': 'Enclosed R', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 338, 'bleu_score': 0.871753795257968, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17681569554459143831}, 'section': 'Section::::Abstract.'}]}]