Question: when was the great sphinx of giza discovered
[{'answer': '1817', 'provenance': [{'wikipedia_id': '245173', 'title': 'Great Sphinx of Giza', 'start_paragraph_id': 44, 'start_character': 6, 'end_paragraph_id': 44, 'end_character': 10, 'bleu_score': 1.0, 'section': 'Section::::Restoration.\n'}]}, {'provenance': [{'wikipedia_id': '245173', 'title': 'Great Sphinx of Giza', 'start_paragraph_id': 44, 'start_character': 0, 'end_paragraph_id': 44, 'end_character': 141, 'bleu_score': 0.9067110266941041, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7561025633252225568}, 'section': 'Section::::Restoration.\n'}]}]