Question: why in 508 bc did athens turn to a democratic form of government
[{'answer': 'The reforms of Cleisthenes', 'provenance': [{'wikipedia_id': '51992830', 'title': 'Athenian democracy', 'start_paragraph_id': 66, 'start_character': 0, 'end_paragraph_id': 66, 'end_character': 26, 'bleu_score': 1.0, 'section': 'Section::::Main bodies of governance.:Archons and the Areopagus.\n'}]}]