Question: where does the stone come from to make curling stones
[{'answer': 'Ailsa Craig', 'provenance': [{'wikipedia_id': '6644', 'title': 'Curling', 'start_paragraph_id': 27, 'start_character': 51, 'end_paragraph_id': 27, 'end_character': 62, 'bleu_score': 1.0, 'section': 'Section::::Equipment.:Curling stone.\n'}]}, {'answer': 'Trefor Granite Quarry in Wales', 'provenance': [{'wikipedia_id': '6644', 'title': 'Curling', 'start_paragraph_id': 27, 'start_character': 118, 'end_paragraph_id': 27, 'end_character': 148, 'bleu_score': 1.0, 'section': 'Section::::Equipment.:Curling stone.\n'}]}, {'provenance': [{'wikipedia_id': '6644', 'title': 'Curling', 'start_paragraph_id': 27, 'start_character': 0, 'end_paragraph_id': 27, 'end_character': 148, 'bleu_score': 0.9243880458347601, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16632123711810530987}, 'section': 'Section::::Equipment.:Curling stone.\n'}]}]