Question: which river takes its name from loess soil
[{'answer': 'the Yellow River', 'provenance': [{'wikipedia_id': '50819', 'title': 'Yellow River', 'start_paragraph_id': 4, 'start_character': 127, 'end_paragraph_id': 4, 'end_character': 143, 'bleu_score': 1.0, 'section': 'Section::::Name.\n'}]}, {'provenance': [{'wikipedia_id': '50819', 'title': 'Yellow River', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 616, 'bleu_score': 0.8710551487123601, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2393942158639718057}, 'section': 'Section::::Name.\n'}]}]