Question: how much did the piedra del sol weight
[{'answer': 'about 24 tons'}, {'provenance': [{'wikipedia_id': '3398101', 'title': 'Aztec sun stone', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 716, 'bleu_score': 0.6259205778525591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 850613498146396622}, 'section': 'Section::::Abstract.'}]}]