Question: where does the ohio river start and finish
[{'answer': 'Pittsburgh , Pennsylvania', 'provenance': [{'wikipedia_id': '22388', 'title': 'Ohio River', 'start_paragraph_id': 149, 'start_character': 156, 'end_paragraph_id': 149, 'end_character': 181, 'bleu_score': 1.0, 'section': 'Section::::Cities and towns along the river.\n'}]}, {'answer': 'the Mississippi River', 'provenance': [{'wikipedia_id': '22388', 'title': 'Ohio River', 'start_paragraph_id': 1, 'start_character': 149, 'end_paragraph_id': 1, 'end_character': 170, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '22388', 'title': 'Ohio River', 'start_paragraph_id': 34, 'start_character': 0, 'end_paragraph_id': 34, 'end_character': 391, 'bleu_score': 0.545822456100986, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8269938638108422531}, 'section': 'Section::::Geography and hydrography.\n'}]}]