Question: how many dice are used in a standard game of backgammon
[{'answer': 'two', 'provenance': [{'wikipedia_id': '4329', 'title': 'Backgammon', 'start_paragraph_id': 1, 'start_character': 154, 'end_paragraph_id': 1, 'end_character': 157, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]