Question: flowers that bloom only one night a year
[{'answer': 'Selenicereus grandiflorus', 'provenance': [{'wikipedia_id': '470261', 'title': 'Night-blooming cereus', 'start_paragraph_id': 1, 'start_character': 181, 'end_paragraph_id': 1, 'end_character': 206, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '470261', 'title': 'Night-blooming cereus', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 482, 'bleu_score': 0.976327165973018, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17625207938354307494}, 'section': 'Section::::Abstract.'}]}]