Question: when did the land before time come out
[{'answer': 'November 18 , 1988', 'provenance': [{'wikipedia_id': '1239400', 'title': 'The Land Before Time', 'start_paragraph_id': 4, 'start_character': 34, 'end_paragraph_id': 4, 'end_character': 52, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]