Question: how many years ago did wolves evolve into dogs
[{'answer': '20,000 - 40,000 YBP', 'provenance': [{'wikipedia_id': '5141410', 'title': 'Origin of the domestic dog', 'start_paragraph_id': 34, 'start_character': 814, 'end_paragraph_id': 34, 'end_character': 832, 'bleu_score': 1.0, 'section': 'Section::::Divergence from wolves.:Place of genetic divergence.:Two origins disputed.\n'}]}, {'provenance': [{'wikipedia_id': '5141410', 'title': 'Origin of the domestic dog', 'start_paragraph_id': 34, 'start_character': 426, 'end_paragraph_id': 34, 'end_character': 1085, 'bleu_score': 0.576399851523518, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15468599479477538440}, 'section': 'Section::::Divergence from wolves.:Place of genetic divergence.:Two origins disputed.\n'}]}]