Question: who was the first step pyramid built for
[{'answer': 'Djoser', 'provenance': [{'wikipedia_id': '113090', 'title': 'Pyramid of Djoser', 'start_paragraph_id': 0, 'start_character': 11, 'end_paragraph_id': 0, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]