Question: how many seasons of little house on the prairie were there
[{'answer': '9', 'provenance': [{'wikipedia_id': '521317', 'title': 'Little House on the Prairie (TV series)', 'start_paragraph_id': 1, 'start_character': 491, 'end_paragraph_id': 1, 'end_character': 492, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]