Question: when did disney buy the nightmare before christmas
[{'answer': '1990', 'provenance': [{'wikipedia_id': '403227', 'title': 'The Nightmare Before Christmas', 'start_paragraph_id': 2, 'start_character': 411, 'end_paragraph_id': 2, 'end_character': 415, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '403227', 'title': 'The Nightmare Before Christmas', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 647, 'bleu_score': 0.8157491009546021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8128320318910540580}, 'section': 'Section::::Abstract.'}]}]