Question: what is the source of the yangtze river
[{'answer': 'Qinghai', 'provenance': [{'wikipedia_id': '6613', 'title': 'Yangtze', 'start_paragraph_id': 15, 'start_character': 125, 'end_paragraph_id': 15, 'end_character': 132, 'bleu_score': 1.0, 'section': 'Section::::Names.:Chinese.:"Jinsha Jiang" – "Gold Sands River".\n'}]}, {'provenance': [{'wikipedia_id': '6613', 'title': 'Yangtze', 'start_paragraph_id': 19, 'start_character': 0, 'end_paragraph_id': 19, 'end_character': 318, 'bleu_score': 0.777755874152052, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4399702679037563393}, 'section': 'Section::::Names.:Chinese.:Tuotuo River.\n'}]}]