Question: when did cultures in peru begin the practice of mummification
[{'answer': 'around 5050 BC', 'provenance': [{'wikipedia_id': '3244110', 'title': 'Chinchorro mummies', 'start_paragraph_id': 1, 'start_character': 426, 'end_paragraph_id': 1, 'end_character': 440, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3244110', 'title': 'Chinchorro mummies', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 440, 'bleu_score': 0.970795021215021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12509163186962176903}, 'section': 'Section::::Abstract.'}]}]