Question: when was the national world war ii memorial built
[{'answer': 'April 29 , 2004', 'provenance': [{'wikipedia_id': '426008', 'title': 'World War II Memorial', 'start_paragraph_id': 34, 'start_character': 37, 'end_paragraph_id': 34, 'end_character': 52, 'bleu_score': 1.0, 'section': 'Section::::Construction.\n'}]}, {'provenance': [{'wikipedia_id': '426008', 'title': 'World War II Memorial', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 245, 'bleu_score': 0.7280233174452021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5862980090456723842}, 'section': 'Section::::Abstract.'}]}]