Question: what is the great sphinx made out of
[{'answer': 'limestone', 'provenance': [{'wikipedia_id': '245173', 'title': 'Great Sphinx of Giza', 'start_paragraph_id': 1, 'start_character': 129, 'end_paragraph_id': 1, 'end_character': 138, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '245173', 'title': 'Great Sphinx of Giza', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 424, 'bleu_score': 0.8488605289566381, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1546056255800751015}, 'section': 'Section::::Abstract.'}]}]