Question: what era relates to the old stone age from around 3 million years ago to 9000 bc
[{'answer': 'Paleolithic', 'provenance': [{'wikipedia_id': '29219', 'title': 'Stone Age', 'start_paragraph_id': 30, 'start_character': 334, 'end_paragraph_id': 30, 'end_character': 345, 'bleu_score': 1.0, 'section': 'Section::::Stone Age in archaeology.:Three-stage system.\n'}]}]