Question: when did animal kingdom open in disney world
[{'answer': 'April 22 , 1998', 'provenance': [{'wikipedia_id': '501999', 'title': "Disney's Animal Kingdom", 'start_paragraph_id': 42, 'start_character': 556, 'end_paragraph_id': 42, 'end_character': 571, 'bleu_score': 1.0, 'section': 'Section::::Former and unbuilt areas.:Camp Minnie-Mickey.\n'}]}]