Question: the u.s. holiday that eventually became memorial day was first known as what
[{'answer': 'Decoration Day', 'provenance': [{'wikipedia_id': '56191', 'title': 'Memorial Day', 'start_paragraph_id': 1, 'start_character': 47, 'end_paragraph_id': 1, 'end_character': 61, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]