Question: what river is associated with the city of rome
[{'answer': 'Tiber', 'provenance': [{'wikipedia_id': '30359', 'title': 'Tiber', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 5, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'The Tiber', 'provenance': [{'wikipedia_id': '30359', 'title': 'Tiber', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 9, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '30359', 'title': 'Tiber', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 386, 'bleu_score': 0.711398406703712, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5643106272719437537}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '30359', 'title': 'Tiber', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['The Tiber (; ; ) is the third-longest river in Italy, rising in the Apennine Mountains in Emilia-Romagna and flowing through Tuscany, Umbria and Lazio, where it is joined by the river Aniene, to the Tyrrhenian Sea, between Ostia and Fiumicino. It drains a basin estimated at . The river has achieved lasting fame as the main watercourse of the city of Rome, founded on its eastern banks.', 'The Tiber (; ; ) is the third-longest river in Italy, rising in the Apennine Mountains in Emilia-Romagna and flowing through Tuscany', 'The Tiber (; ; ) is the third-longest river in Italy, rising in the Apennine Mountains in Emilia-Romagna and flowing through Tuscany, Umbria and Lazio, where it is joined by the river Aniene, to the Tyrrhenian Sea, between Ostia and Fiumicino. It drains a basin estimated at . The river has achieved lasting fame as the main watercourse of the city of Rome, founded on its eastern banks.']}}]}]