Question: who is chief god according to ancient greek myth
[{'answer': 'Zeus', 'provenance': [{'wikipedia_id': '574742', 'title': 'Twelve Olympians', 'start_paragraph_id': 1, 'start_character': 133, 'end_paragraph_id': 1, 'end_character': 137, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]