Question: what are the little balls in boba tea
[{'answer': 'chewy tapioca balls', 'provenance': [{'wikipedia_id': '4045', 'title': 'Bubble tea', 'start_paragraph_id': 1, 'start_character': 260, 'end_paragraph_id': 1, 'end_character': 279, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]