Question: the longest wavelengths in the visible spectrum are
[{'answer': 'Red', 'provenance': [{'wikipedia_id': '41464', 'title': 'Visible spectrum', 'start_paragraph_id': 3, 'start_character': 220, 'end_paragraph_id': 3, 'end_character': 223, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]