Question: cities in the athenian empire paid what to athens
[{'answer': 'tribute', 'provenance': [{'wikipedia_id': '2037', 'title': 'Delian League', 'start_paragraph_id': 5, 'start_character': 163, 'end_paragraph_id': 5, 'end_character': 170, 'bleu_score': 1.0, 'section': 'Section::::Background.\n'}]}, {'provenance': [{'wikipedia_id': '2037', 'title': 'Delian League', 'start_paragraph_id': 38, 'start_character': 0, 'end_paragraph_id': 38, 'end_character': 525, 'bleu_score': 0.9087411484584831, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2345048861219287381}, 'section': 'Section::::The Athenian Empire (454–404 BC).\n'}]}]