Question: when did the olympic games began in ancient greece
[{'answer': '776 BC', 'provenance': [{'wikipedia_id': '19098431', 'title': 'Ancient Olympic Games', 'start_paragraph_id': 1, 'start_character': 500, 'end_paragraph_id': 1, 'end_character': 506, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '19098431', 'title': 'Ancient Olympic Games', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 816, 'bleu_score': 0.9026854644647091, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3692177738431571986}, 'section': 'Section::::Abstract.'}]}]