Question: river that joins the ouse to form humber estuary
[{'answer': 'River Trent', 'provenance': [{'wikipedia_id': '151594', 'title': 'River Ouse, Yorkshire', 'start_paragraph_id': 2, 'start_character': 312, 'end_paragraph_id': 2, 'end_character': 323, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '151594', 'title': 'River Ouse, Yorkshire', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 396, 'bleu_score': 0.9735040436119741, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16908144396265104924}, 'section': 'Section::::Abstract.'}]}]