Question: monty python and the holy grail who killed the historian
[{'answer': 'knight on horseback', 'provenance': [{'wikipedia_id': '19701', 'title': 'Monty Python and the Holy Grail', 'start_paragraph_id': 6, 'start_character': 544, 'end_paragraph_id': 6, 'end_character': 563, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}]