Question: what type of symmetry do sand dollars have
[{'answer': 'radial symmetry', 'provenance': [{'wikipedia_id': '181169', 'title': 'Sand dollar', 'start_paragraph_id': 4, 'start_character': 73, 'end_paragraph_id': 4, 'end_character': 88, 'bleu_score': 1.0, 'section': 'Section::::Anatomy.\n'}]}, {'answer': 'secondary front - to - back bilateral symmetry'}, {'provenance': [{'wikipedia_id': '181169', 'title': 'Sand dollar', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 855, 'bleu_score': 0.986253478180058, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 162966796208895263}, 'section': 'Section::::Anatomy.\n'}]}]