Question: how much does a rock cost in curling
[{'answer': 'around US $ 650 each'}, {'provenance': [{'wikipedia_id': '6644', 'title': 'Curling', 'start_paragraph_id': 32, 'start_character': 0, 'end_paragraph_id': 32, 'end_character': 544, 'bleu_score': 0.5142048677445631, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6605081099559721703}, 'section': 'Section::::Equipment.:Curling stone.\n'}]}]