Question: who was the first pharaoh to be buried in a pyramid
[{'answer': 'Djoser', 'provenance': [{'wikipedia_id': '864667', 'title': 'Egyptian pyramids', 'start_paragraph_id': 2, 'start_character': 124, 'end_paragraph_id': 2, 'end_character': 130, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]