Question: where did the stones come from to build stonehenge
[{'answer': 'Preseli Hills', 'provenance': [{'wikipedia_id': '27633', 'title': 'Stonehenge', 'start_paragraph_id': 21, 'start_character': 673, 'end_paragraph_id': 21, 'end_character': 686, 'bleu_score': 1.0, 'section': 'Section::::Early history.:Stonehenge 3 I (c. 2600 BC).\n'}]}, {'answer': 'modern - day Pembrokeshire in Wales'}, {'answer': 'glacial erratics by the Irish Sea Glacier'}, {'provenance': [{'wikipedia_id': '27633', 'title': 'Stonehenge', 'start_paragraph_id': 21, 'start_character': 0, 'end_paragraph_id': 21, 'end_character': 924, 'bleu_score': 0.9534826893608551, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18127419415548173446}, 'section': 'Section::::Early history.:Stonehenge 3 I (c. 2600 BC).\n'}]}]